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Shown above are 5 equal triangles formed with 15 matchsticks. Note how the triangles are placed exactly in the middle of an adjacent triangle.
Move 3 matchsticks to form 10 triangles. The rules are:
- All matchsticks must be flat on the surface
- No matchstick may be broken
- The full length of each matchstick must form part of a triangle
- 6 of the 10 triangles must be equal in size.
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