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It is one of two most simple base forms.
To fold it, it is necessary to make only one crease - the diagonal of the square.
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The following simple base form.
As well as at folding the triangle, it is enough to us to make only one crease.
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The base form a door turns out from the book.
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The kite - one more rather simple base form.
It turns out from the triangle.
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Now you can turn to the
imtermediate base forms.
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