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DECLRMM might work for us - it is approximately what we’re doing by deleting a character on each line when moving horizontally - but it has extremely poor terminal support so I didn’t want to rely on it.
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Number (9): Everything in this space must add up to 9. The answer is 6-5, placed horizontally; 1-4, placed vertically.
# 110M TDT-CTC (default)