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Since we're arranging squares, I'm assuming the arrangements are all going to be only two-dimensional and no stacking is allowed. If you have played tetris before, you'll know that can be arranged into :

1) A straight line

2) A 2 by 2 square

3) A T-shape

4) A L-shape

5) An inverted L-shape

6) A ladder

7) An inverted ladder

That's all the seven different arrangements for four squares.

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11y ago

What else can I help you with?