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Take a balloon and blow it.   You can see that the shape and size of the balloon have changed.

Was it possible to get the balloon back to its original shape and size ?

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Take a piece of paper and fold it as shown in the below figure.   You have changed the sheet into a toy aero plane.   Once you tired of it, unfold the paper again.

Was the size of the paper same as before and after making an aero plane?

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Take some dough and make a ball.   Try to roll out a roti as shown below.

Was it possible to get back the ball of dough again ?