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Make 1 square with matches, and move three matchsticks into three small squares. What shape is it after moving?
Pippi: Kiki, I made three triangles with nine matches. Now, please move three matches in the original picture at a time, so that the triangle in the picture becomes four.

Example 3 Use matchsticks to set out 1 triangle, 1 square, 1 diamond, 1 rectangle, 1 parallelogram and 1 isosceles.