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Not a crossword clue, but I hope someone can help. Have been doing some "conundrums" - you know the sort of thing, eg. 64 S on a C B = 64 squares on a chess board; 12 L of H = 12 labours of Hercules, etc. Have done 49/50 but stuck on the last one which is 1 S on a M S. Any ideas anyone?

1 side on a Moebius Strip

alternative spelling is Mobius Strip

Wow, would never have thought of that. Thank you.