Comments about #13100

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toast: You did well to strike a good balance in having lots of possible groups but leaving enough clues to the way in so it wasn't just an exercise for fast fingers. (6 months, 2 weeks ago)

Dr Neil: Good one! I enjoyed it. (6 months, 2 weeks ago)

Omegaman: Liked it, thanks. (6 months, 3 weeks ago)

QWERTY^9: Great bit hard (6 months, 3 weeks ago)