Take an A4 piece of paper.
Fold it a few times.
Then punch a hole through the paper.
Before you unfold your paper, can you draw on a fresh piece of paper where you think the holes will be?
Then can you fold a piece of paper and punch it to make the holes look like this:
Then can you fold and cut a piece of paper to make it wider then it was originally? Can you cut in such a way that you can step through it?
Similar ideas can be found here. Solution to stepping through it here.