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CBSE Class 6 Mathematics Chapter 9 Symmetry: mind map & revision

CBSE Class 6 Mathematics Chapter 9 Symmetry opens a window into the beautiful balance and order found in nature, art, and architecture. From the perfectly mirrored wings of a butterfly to the radial petals of a sunflower, symmetry is everywhere. In this chapter of NCERT Class 6 Mathematics, students learn to identify line symmetry (reflection symmetry) — the property that allows a shape to be folded along a line so both halves coincide exactly. They also gain an intuitive sense of rotational symmetry through observation. This mind map and revision guide unpacks every concept, provides visual aids, and offers targeted practice strategies to help your child excel in Class 6 Mathematics solutions and term assessments.

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Key takeaways

  • CBSE Class 6 Mathematics Chapter 9 Symmetry focuses on line symmetry and introduces rotational symmetry intuitively without formal definitions.
  • A figure has line symmetry if a line divides it into two identical halves that are mirror images of each other.
  • Common shapes like circles have infinite lines of symmetry, while equilateral triangles have exactly three.
  • Real-world symmetric objects — butterflies, leaves, human faces — help students connect geometry to everyday observation.
  • Paper-folding and mirror activities in NCERT Class 6 Mathematics Chapter 9 develop hands-on spatial reasoning skills.
  • Recognizing symmetry is foundational for tessellations, transformations, and coordinate geometry in Classes 7–10.
  • CBSE 6 Mathematics term exams typically allocate 4–6 marks to this chapter through MCQs and diagram-based questions.

Mind Map Overview: CBSE Class 6 Mathematics Chapter 9 Symmetry

A mind map is an effective tool to visualize the structure of CBSE Class 6 Mathematics Chapter 9 Symmetry. At the center, place 'Symmetry'. Branch out into two main themes: Line Symmetry and Rotational Symmetry (intuitive). Under Line Symmetry, create sub-branches for definition, method to find lines of symmetry (paper folding, mirror test), examples from NCERT (equilateral triangle, square, rectangle, circle, isosceles triangle), and real-world symmetric figures (butterfly, human face, leaves, buildings). Under Rotational Symmetry, note that NCERT introduces it through observation only — students see that some shapes look the same after a partial turn, such as a square or a circle, without formal angle calculations. Add a branch for exercises and practice: identifying lines of symmetry in given figures, drawing symmetric halves, and recognizing asymmetric shapes. This visual structure helps students recall concepts quickly during revision and connects the abstract geometry to tangible examples from their surroundings.
  • Central node: Symmetry in CBSE Class 6 Mathematics Chapter 9
  • Main branch 1: Line Symmetry — definition, paper-folding method, mirror test
  • Sub-branch: Examples — equilateral triangle (3 lines), square (4 lines), rectangle (2 lines), circle (infinite lines)
  • Main branch 2: Rotational Symmetry — intuitive observation (square looks same after 90° turn)
  • Real-world connections: butterfly wings, rangoli patterns, Taj Mahal facade, playing cards (King, Queen)
  • Practice branch: NCERT exercises, worksheet problems, symmetry scavenger hunt at home

Understanding Line Symmetry in NCERT Class 6 Mathematics

Line symmetry, also called reflection symmetry, is the core focus of CBSE Class 6 Mathematics Chapter 9 Symmetry. A figure has line symmetry if you can draw a line through it such that one half is the exact mirror image of the other half. This line is called the line of symmetry or axis of symmetry. To test for line symmetry, NCERT suggests two practical methods: paper folding (fold the shape along a suspected line; if both halves match perfectly, it is a line of symmetry) and the mirror test (place a small mirror along the line; the reflection should recreate the other half). For instance, an equilateral triangle has three lines of symmetry — one through each vertex perpendicular to the opposite side. A square has four: two diagonals and two lines joining midpoints of opposite sides. A rectangle, however, has only two lines of symmetry (vertical and horizontal through the center), not four, because its diagonals do not produce mirror halves. Understanding these distinctions is crucial for solving Class 6 Mathematics solutions accurately.
  • Line symmetry means one half of a figure is a mirror image of the other across a line.
  • The line of symmetry is also called the axis of symmetry.
  • Paper-folding test: fold along the line; if edges and vertices match, the line is a line of symmetry.
  • Mirror test: place a mirror perpendicular to the figure; the reflection should complete the shape.
  • Not all lines through a shape are lines of symmetry — they must produce exact mirror halves.

Comparing Lines of Symmetry Across Common Shapes

One of the most testable aspects of CBSE Class 6 Mathematics Chapter 9 Symmetry is knowing how many lines of symmetry different polygons and shapes possess. NCERT Class 6 Mathematics provides clear examples: a circle has infinitely many lines of symmetry (any diameter), making it the most symmetric two-dimensional shape. An equilateral triangle has three, a square four, and a regular pentagon five. Interestingly, a rectangle has only two lines of symmetry (not four), because folding along its diagonals does not produce mirror halves. An isosceles triangle has one line of symmetry, while a scalene triangle has none. For parallelograms (other than rectangles), there are typically no lines of symmetry, even though they have rotational symmetry. This table helps students quickly compare and recall these facts for Class 6 Mathematics notes and term exams.

Step-by-Step: Finding Lines of Symmetry Using Paper Folding

NCERT Class 6 Mathematics recommends a hands-on paper-folding activity to discover lines of symmetry, and this method is a favorite in CBSE 6 Mathematics classrooms. To apply this technique for CBSE Class 6 Mathematics Chapter 9 Symmetry: first, trace or cut out the shape on a piece of paper. Second, fold the paper along a suspected line of symmetry. Third, check if the edges, vertices, and any markings on both halves align perfectly. If they do, you have found a line of symmetry. If not, try a different fold. For a square, students can fold along the vertical midline, the horizontal midline, and both diagonals — discovering all four lines of symmetry. For a circle, any fold through the center (any diameter) works, illustrating infinite symmetry. This tactile approach deepens understanding far more effectively than rote memorization, and it is directly aligned with the NCERT pedagogy that values experiential learning.
  • Step 1: Trace or cut out the figure on paper or use a printout.
  • Step 2: Fold the paper along a line you suspect might be a line of symmetry.
  • Step 3: Hold the fold up to light or press firmly — check if all edges and corners match.
  • Step 4: If they match exactly, that fold line is a line of symmetry; if not, try another line.
  • Step 5: Repeat for all possible orientations to count total lines of symmetry.
  • Tip: Use tracing paper or transparent sheets for easier verification.

Real-World Examples of Symmetry from NCERT Class 6 Mathematics

CBSE Class 6 Mathematics Chapter 9 Symmetry is rich with real-world connections that make geometry relatable and memorable. NCERT highlights natural symmetric objects such as butterfly wings (one vertical line of symmetry), human faces (approximate vertical line through the nose), leaves (many have one line), and flowers (radial symmetry with multiple lines). Man-made examples include the Taj Mahal (vertical line of symmetry down its central dome and facade), playing cards (Kings and Queens are designed with vertical symmetry so they look correct when held upside down), and traditional Indian rangoli patterns (often exhibiting multiple lines and rotational symmetry). Road signs like the 'Stop' octagon and the triangular 'Yield' sign also display line symmetry. Teachers often assign a 'symmetry scavenger hunt' where students photograph or sketch 10 symmetric objects at home or school — a powerful way to internalize concepts. Recognizing symmetry in the environment trains the eye for proportion, balance, and design, skills that extend beyond Class 6 Mathematics solutions into art, architecture, and engineering.
  • Natural examples: butterfly (1 line), starfish (5 lines), snowflakes (6 lines), leaves (often 1 line)
  • Human body: approximate vertical line of symmetry through the center
  • Architectural: Taj Mahal, India Gate, Lotus Temple — all have prominent vertical symmetry
  • Everyday objects: playing cards (face cards), clock faces (radial symmetry), alphabets (A, H, M, T, U, V, W, Y have vertical symmetry; B, C, D, E have horizontal)
  • Cultural: rangoli designs, mandalas, kolam patterns — multiple lines of symmetry

Introduction to Rotational Symmetry in CBSE Class 6 Mathematics Chapter 9

While line symmetry is the primary focus, NCERT Class 6 Mathematics also introduces rotational symmetry at an intuitive level in CBSE Class 6 Mathematics Chapter 9 Symmetry. Rotational symmetry occurs when a figure looks identical after being rotated by less than 360 degrees around a central point. For example, a square has rotational symmetry of order four: it looks the same after rotations of 90°, 180°, 270°, and 360°. An equilateral triangle has rotational symmetry of order three (120°, 240°, 360°). A circle has infinite rotational symmetry. At the Class 6 level, NCERT does not require students to calculate angles or formally define the order of symmetry — instead, they observe and recognize that certain shapes 'repeat' their appearance during a turn. This intuitive grounding prepares students for the formal treatment of rotational symmetry in Class 7 Mathematics. Teachers often use physical cut-outs and ask students to rotate them on a pin to see when the shape matches its original position, making the concept concrete and engaging.
  • Rotational symmetry means a shape looks the same after a partial turn around a center point.
  • Order of rotational symmetry = number of times the shape matches itself in one full 360° rotation.
  • Square: order 4 (matches at 90°, 180°, 270°, 360°).
  • Equilateral triangle: order 3 (matches at 120°, 240°, 360°).
  • Circle: infinite rotational symmetry (matches at every angle).
  • Rectangle (non-square): order 2 (matches at 180° and 360° only).

Common Mistakes Students Make in Class 6 Mathematics Symmetry

Even though CBSE Class 6 Mathematics Chapter 9 Symmetry is visually intuitive, students often make predictable errors. First, confusing diagonals with lines of symmetry: in a rectangle, the diagonals are not lines of symmetry because folding along them does not produce matching halves. Second, assuming all quadrilaterals have symmetry: a general quadrilateral or a trapezium (other than an isosceles trapezium) typically has no lines of symmetry. Third, over-counting lines in a circle by drawing random chords instead of diameters — only diameters are lines of symmetry. Fourth, in letters, confusing horizontal and vertical symmetry: the letter 'B' has a horizontal line of symmetry, but 'A' has a vertical one; 'O' has both, but 'S' has rotational symmetry and no line symmetry. Fifth, neglecting to check both halves carefully during paper folding, leading to false positives. Class 6 Mathematics notes should include a checklist: always verify by folding or using a mirror, count carefully, and remember that symmetry is about exact matching, not approximate similarity.
  • Mistake 1: Thinking a rectangle has 4 lines of symmetry (correct answer: 2).
  • Mistake 2: Counting any line through a shape as a line of symmetry without testing.
  • Mistake 3: Confusing rotational symmetry with line symmetry (they are different properties).
  • Mistake 4: Assuming all regular polygons have the same number of lines of symmetry (each regular n-gon has n lines).
  • Mistake 5: In real-world examples, ignoring minor asymmetries (e.g., human faces are approximately symmetric, not perfectly).
  • Mistake 6: Drawing lines of symmetry on a circle that are chords, not diameters.

NCERT Exercise Patterns and Question Types in Chapter 9

The exercises in NCERT Class 6 Mathematics Chapter 9 Symmetry are designed to test both recognition and construction skills. Typical question types include: identifying the number of lines of symmetry in a given figure (often a triangle, quadrilateral, or regular polygon); completing a symmetric figure when half is given and the line of symmetry is marked; determining whether a given line is a line of symmetry for a shape; listing real-world objects with one, two, or more lines of symmetry; and sketching all lines of symmetry on a printed shape. CBSE term exams mirror these patterns, frequently using 1-mark MCQs (e.g., 'How many lines of symmetry does an equilateral triangle have?') and 2–3 mark descriptive questions (e.g., 'Draw a rectangle and mark all its lines of symmetry; explain why its diagonals are not lines of symmetry'). Students should practice from NCERT textbook exercises 9.1, 9.2, and 9.3, and supplement with worksheets from CBSE sample papers. Class 6 Mathematics solutions manuals are helpful, but understanding the why behind each answer is more important than memorizing results.
  • Question Type 1: Count and draw all lines of symmetry for given shapes (square, rectangle, circle, triangle).
  • Question Type 2: Complete the other half of a figure given one half and a line of symmetry.
  • Question Type 3: True/False or MCQ on properties (e.g., 'A parallelogram has two lines of symmetry' — False).
  • Question Type 4: Identify symmetric and asymmetric letters from the English alphabet.
  • Question Type 5: Real-world application — name three objects in your home with at least one line of symmetry.
  • Question Type 6: Explain why a given line is or is not a line of symmetry for a figure.

How to Complete a Symmetric Figure: Worked Example

A common exercise in CBSE Class 6 Mathematics Chapter 9 Symmetry is to complete a figure when only half is drawn and the line of symmetry is indicated. Here is a step-by-step method: Suppose you are given the left half of a butterfly and a vertical dashed line representing the line of symmetry. Step 1: Identify key points on the given half, such as the tip of the wing, curves, and the body. Step 2: Measure the perpendicular distance of each key point from the line of symmetry. Step 3: Mark corresponding points on the other side of the line at the same perpendicular distance. Step 4: Join these points smoothly, mirroring the curves and angles of the given half. Step 5: Verify by folding along the line of symmetry (if on paper) or by visual inspection. This method works for any shape — geometric figures, patterns, or designs. Practicing this skill strengthens spatial reasoning and is directly aligned with NCERT Class 6 Mathematics exercises 9.2 and 9.3.

Symmetry in Letters: A Fun Way to Practice CBSE Class 6 Mathematics Chapter 9

NCERT Class 6 Mathematics uses the English alphabet as a playful, accessible context to explore symmetry, and this is a favorite activity in CBSE 6 Mathematics classrooms. Capital letters can be classified by their symmetry. Vertical line of symmetry: A, H, I, M, O, T, U, V, W, X, Y. Horizontal line of symmetry: B, C, D, E, H, I, K, O, X (note: O, H, I, X have both vertical and horizontal lines). No line symmetry but rotational symmetry: N, S, Z (they look the same upside down). No symmetry at all: F, G, J, L, P, Q, R. This exercise is excellent for Class 6 Mathematics notes because it combines geometry with everyday literacy. Students can be asked to write their name and identify which letters are symmetric, or to design a logo using only vertically symmetric letters. Such activities make abstract concepts tangible and fun, improving retention and engagement.

How CBSETUTOR.ai Supports CBSE Class 6 Mathematics Chapter 9 Symmetry Mastery

Parents often ask how to provide targeted help when a child struggles with spatial concepts like symmetry. CBSETUTOR.ai is India's most trusted 24×7 AI tutor for CBSE Classes 6–12, and it has ingested every page of NCERT Class 6 Mathematics, including Chapter 9 Symmetry. If your child is confused about why a rectangle has only two lines of symmetry or cannot visualize the completion of a symmetric figure, they can photograph the problem from their worksheet or textbook and upload it to CBSETUTOR.ai. The AI provides a step-by-step explanation grounded in NCERT language, draws the lines of symmetry on the image, and even suggests hands-on activities like paper folding or using a mirror. At ₹999 per month (one flat price for all classes 6–12), CBSETUTOR.ai offers unlimited questions, personalized practice, and instant doubt resolution — far more affordable than weekly tuition classes. A 3-day free trial is available with no card required, so parents in Bengaluru, Delhi, Mumbai, and across India can try it risk-free. For Chapter 9 Symmetry, the AI can generate custom worksheets with varying difficulty, track progress, and highlight exactly which types of symmetry questions need more practice.
  • Upload any Class 6 Mathematics Symmetry worksheet or NCERT exercise as a photo for instant help.
  • AI explains line symmetry, rotational symmetry, and mirror tests in simple, NCERT-aligned language.
  • Generates custom practice questions: complete-the-figure, count-the-lines, real-world examples.
  • Available 24×7 — perfect for last-minute revision before term exams or when parents are unavailable.
  • Flat ₹999/month for Classes 6–12; 3-day free trial, no card required.
  • Tracks weak areas (e.g., 'struggles with non-regular polygons') and provides targeted practice.

Exam Strategy: Scoring Full Marks in CBSE Class 6 Mathematics Chapter 9 Symmetry

CBSE Class 6 Mathematics Chapter 9 Symmetry typically accounts for 4–6 marks in the term exam, with a mix of objective and short-answer questions. To score full marks: first, memorize the number of lines of symmetry for standard shapes (circle: infinite; square: 4; rectangle: 2; equilateral triangle: 3; isosceles triangle: 1; scalene triangle: 0; regular pentagon: 5). Second, practice drawing lines of symmetry neatly using a ruler — marks can be deducted for freehand wobbly lines. Third, for complete-the-figure questions, always use a pencil first, measure distances carefully with a ruler, and check symmetry by folding if the answer sheet allows. Fourth, read questions carefully: distinguish between 'line symmetry' and 'rotational symmetry'. Fifth, in real-world identification questions, provide clear, specific examples (e.g., 'butterfly' not just 'insect'). Sixth, review common mistakes — do not count diagonals of a rectangle as lines of symmetry. Practicing 10–15 varied problems from NCERT and CBSE sample papers is usually sufficient for mastery. Time management is key: symmetry questions are typically quick (1–2 minutes each), so do not overthink.
  • Memorize lines of symmetry for 8–10 standard shapes before the exam.
  • Always use a ruler and pencil for drawing lines of symmetry — presentation matters.
  • In MCQs, eliminate obviously wrong options first (e.g., 'rectangle has 4 lines' — eliminate immediately).
  • For complete-the-figure questions, mark key points first, then join smoothly.
  • In real-world questions, be specific: 'kite (toy)' or 'Ashoka Chakra' instead of vague answers.
  • Review NCERT exercises 9.1, 9.2, 9.3 at least twice; redo problems you got wrong the first time.

Connecting Symmetry to Higher Classes: What Comes Next

CBSE Class 6 Mathematics Chapter 9 Symmetry is not a standalone topic — it is foundational for several advanced concepts in Classes 7–10. In Class 7, students revisit symmetry in the context of geometric constructions and explore rotational symmetry formally, calculating angles and order. In Class 8, symmetry principles underpin understanding of congruence and transformations (translation, rotation, reflection). In Class 9, coordinate geometry uses reflection symmetry across axes, and students learn to find symmetric points algebraically. In Class 10, symmetry appears in trigonometric graphs (sine and cosine functions are symmetric) and in geometric proofs. Beyond CBSE, symmetry is central to group theory in higher mathematics, crystallography in chemistry, and architectural design. By mastering Class 6 Mathematics solutions for this chapter, students build spatial reasoning and pattern recognition that pays dividends across STEM subjects. Teachers and parents should emphasize that symmetry is not just 'shapes that look nice' — it is a mathematical property with deep applications.
  • Class 7: Formal rotational symmetry (order, angle of rotation) and more complex constructions.
  • Class 8: Congruence and transformations (reflection, rotation, translation) rely on symmetry concepts.
  • Class 9: Coordinate geometry — finding reflections of points across x-axis, y-axis, origin.
  • Class 10: Symmetry in graphs (parabola, sine/cosine), properties of isosceles triangles in proofs.
  • Beyond CBSE: Symmetry groups in algebra, molecular symmetry in chemistry, tessellations in art.
  • Career connections: architecture, graphic design, robotics, computer graphics — all use symmetry principles.

Frequently asked questions

How many marks does CBSE Class 6 Mathematics Chapter 9 Symmetry carry in the term exam?+
CBSE Class 6 Mathematics Chapter 9 Symmetry typically carries 4–6 marks in the term exam, distributed across 2–3 questions. Expect one MCQ (1 mark) on counting lines of symmetry, one 2-mark question on completing a symmetric figure, and possibly one 3-mark question involving real-world examples or explanation. Practicing NCERT exercises 9.1 to 9.3 ensures coverage of all question types.
Why does a rectangle have only 2 lines of symmetry and not 4 like a square?+
A rectangle has only 2 lines of symmetry because its diagonals are not lines of symmetry. When you fold a rectangle along a diagonal, the two halves do not match (the lengths and widths do not align). Only the vertical line through the midpoints of the longer sides and the horizontal line through the midpoints of the shorter sides produce mirror-image halves. A square has 4 because its sides are equal, so diagonals also create matching halves.
Can my child use CBSETUTOR.ai to practice symmetry problems from their school worksheet?+
Yes, absolutely. CBSETUTOR.ai allows students to upload a photo of any Class 6 Mathematics worksheet or NCERT exercise, including Chapter 9 Symmetry problems. The AI will identify the question, explain the concept (line symmetry, mirror test, etc.), show step-by-step solutions, and even draw the lines of symmetry on the uploaded image. It is available 24×7 at ₹999/month for all Classes 6–12, with a 3-day free trial and no card required.
What are some easy real-world examples of symmetry my child can observe at home?+
Common examples include: a butterfly (1 vertical line of symmetry), a human face (approximate vertical symmetry), a clock face (multiple lines through 12-6, 3-9, etc.), playing cards like Kings and Queens (vertical symmetry), a folded paper napkin, the Indian national flag (vertical symmetry), a pair of shoes (each shoe is asymmetric, but the pair shows mirror symmetry), and rangoli or kolam designs displayed during festivals.
Is rotational symmetry formally tested in CBSE Class 6 Mathematics Chapter 9 Symmetry?+
No, NCERT Class 6 Mathematics introduces rotational symmetry only at an intuitive level. Students observe that some shapes like a square or equilateral triangle look the same after a partial turn, but they are not required to calculate angles or define order of symmetry. Formal treatment with precise definitions and calculations appears in Class 7 Mathematics. Class 6 exams may have a 1-mark observation question but nothing rigorous.
How can my child practice completing symmetric figures if the textbook has limited examples?+
Beyond NCERT exercises, use CBSE sample papers and worksheets from educational websites. You can also create custom problems: draw half of a simple shape (heart, leaf, kite) on grid paper with a marked line of symmetry, and ask your child to complete it. CBSETUTOR.ai can generate unlimited complete-the-figure problems tailored to Class 6 Mathematics Chapter 9 Symmetry, adjusting difficulty based on your child's performance.
Which English alphabet letters have both vertical and horizontal lines of symmetry?+
In capital letters, only four have both vertical and horizontal lines of symmetry: H, I, O, and X. These letters look the same when reflected across a vertical line and when reflected across a horizontal line. This is a popular question type in CBSE Class 6 Mathematics Chapter 9 Symmetry exams and a fun way to practice symmetry concepts using familiar shapes.
My child confuses line symmetry and rotational symmetry. How can I help them distinguish the two?+
Explain that line symmetry involves a fold or mirror: one half is a reflection of the other across a line. Rotational symmetry involves turning the shape around a central point: it looks identical after a partial rotation. Use hands-on demos: for line symmetry, fold paper; for rotational symmetry, pin a cut-out at the center and spin it. A square has both (4 lines of symmetry and rotational symmetry of order 4), but the letter S has only rotational symmetry (no line symmetry).
Are there any common mistakes students make in CBSE Class 6 Mathematics Chapter 9 Symmetry that I should watch for?+
Yes. Common errors include: counting rectangle diagonals as lines of symmetry (incorrect), assuming all quadrilaterals have symmetry, over-counting lines in a circle by including chords instead of only diameters, confusing symmetry types (line vs. rotational), and not verifying folds carefully during paper tests. Reviewing these mistakes in Class 6 Mathematics notes and practicing corrective examples prevents mark loss in exams.
How much time should my child spend revising Chapter 9 Symmetry before the term exam?+
Given that CBSE Class 6 Mathematics Chapter 9 Symmetry carries 4–6 marks and the concepts are visual and intuitive, 2–3 focused revision sessions of 30–40 minutes each are sufficient. In each session, solve 5–6 NCERT problems, review the lines-of-symmetry table for standard shapes, and practice one complete-the-figure question. Use the final session for a mock test with 3–4 symmetry questions under timed conditions.
Does CBSE Class 6 Mathematics Chapter 9 Symmetry require any specific drawing tools or instruments?+
While not mandatory, a ruler, pencil, eraser, and tracing paper make practice much easier. A small pocket mirror (5 cm × 5 cm) is very helpful for the mirror test to verify lines of symmetry. Some teachers recommend a geometry box with a compass and protractor, though these are not strictly needed for Chapter 9. For exams, a sharp pencil and ruler are sufficient for drawing neat, accurate lines of symmetry.
Will my child be at a disadvantage if their school skips or rushes through CBSE Class 6 Mathematics Chapter 9 Symmetry?+
Symmetry is a relatively short, self-contained chapter, so even if school coverage is limited, a child can master it independently using NCERT Class 6 Mathematics textbook exercises and guided practice. However, weak foundations in symmetry can make Class 7 transformations and Class 9 coordinate reflections harder. If you sense gaps, supplement with online resources or CBSETUTOR.ai, which provides structured, NCERT-aligned coverage for ₹999/month across all chapters and classes.

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