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Ah yes, another of life's great mysteries. Here's another...

Why is 22 called twenty two, 33 called thirty three and so on...But...11 isn't called onety one? 111 not called one hundred and onety one?

A mystery for the scholars to unravel.

Or those cunning linguists!

My favorite response to any variation of 'pick a number' is elventy-eleven but my teachers did not approve...

Eleventy eleven is a good number. One doesn't hear it much but when one does, it's pleasing to ones ears.