Comments about #17383

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JS: Not quite sure about the X group ... the definition doesn't quite work for me. Otherwise a good grid. (1 year, 6 months ago)

Mugwump: Liked this one a lot. Solved the grid but then only got 2 of the groups correct - think I solved it by accident! Having said that, I put "Mathematical terms" for Plus, X group and I think that fits so I'm giving myself an extra point... (1 year, 6 months ago)