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Discussion of Problem 1572. Yekaterinozavodsk Great Well

A HINT!
Posted by ₦¯ίμ®@£ 17 Dec 2007 18:50
It's very easy question that need's piece of paper and max 30 min.

HINT:
 The sample is true! When we put some shape in another they mustn't be parallel to each other! In other words, we can rotate shape that we are going to put inside another as we want!