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  1. Square - Wikipedia

  2. The Group of Symmetries of the Square - Mathonline - Wikidot

  3. Symmetry And Line Of Symmetry: An Introduction - BYJU'S

  4. What is Symmetry? - Definition Facts and Examples - SplashLearn

  5. Lines of symmetry for quadrilaterals - Illustrative Mathematics

  6. Square - Math.net

  7. Symmetry of the square - MATHVOX

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