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Actually, that's quite a trick.
Most of the holes I'm familiar with are round. That's a
quality that they seem to be graced with. Not only that, fitting holes
into pegs, even when the pegs are square and the holes are round, is a
bit difficult. Obviously I intended to write something along the lines
of fitting pegs into holes - a rather commonplace and overused metaphor.
It seems that it was so common that I didn't even think about (or copyread)
what I was writing.