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Plus Advent Calendar Door #11: Ding-dong

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Plus Advent Calendar Door #11: Ding-dong

Plain Bob

Bells can do a lot more than just jingle! In fact, being a decent bell ringer requires razor-sharp mathematical precision and a vast memory. And just 16 bells are enough to provide your neighbours with over a million years of non-repeating bellish amusement. Find out how with Ringing the changes.

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