Take 4 black and 4 white big buttons (similar to the size of 1 coin) and put them on a table in a row, following
the pattern of white, black, white, black and so on. Leave a vacant place at one end which can hold 2 buttons.
After 4 moves, all the black buttons should be on one side and the white buttons on the other side.
A move consists of shifting two adjacent buttons, keeping their order, into any vacant space.
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Answer: Yes its true ! I did it in school.
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