1.

	You need to move 2 adjacent pieces at one time. In the problem, you need to move 2 times to make it comingled.. You can not have any gap between pieces when you finish. You are not limited to move in one direction only.

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2.

Take a rope to tie the handle of a cup as shown in the figure. Then tie the vertical end to a fixed nail. How can you untie the rope from the cup handle without cutting the rope, breaking the cup, or releasing it from the other end of the rope? Assume the rope can be as long as you can think of.

Ans:

Lose the tie and make the tie become a big hole and let the cup go though the hole.