Puzzle 22: Extract all cube faces, even for T-shaped nets

At the moment, I can't figure out how to break up the long stem of a
T-shaped net properly (and other similar nets with 2 or more faces in a
straight line), for an arbitrary cuboid. This should be possible, and
was something I was hoping to be able to do for this puzzle.

That's not happening, so add in a hackish solution that takes advantage
of some of the conditions of the Advent of Code rules/input, instead of
being a properly general solution.

If possible, come back and take this out later.

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