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I wrote:

> But then the beauty of the rest of the system would be lost. I was just
> marvelling that so many numbers divide evenly into 360 - from 1 to 20,
> the only ones that don't are 7, 11, 13, 17, 19.

Forgot 16. Still 22.5 is a lot tidier than the other decimals.

Kou