Consider the following diagram. Can you connect each small box on the top with its same-letter mate on the bottom with paths that
do not cross
one another,
nor leave
the boundaries of the large box?
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At first it seems impossible, but let's be optimistic and assume that it is possible. The problem seems unwieldy, so it's a good idea to try to loosen up and make the problem trivially easy:
Now we can try to "push" the floating boxes back to their original positions, one at a time. First the A box:
Now the C box: