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Puzzle - Hint

      ?

A. The year 2013 uses four different digits. When did this last happen?

B. The digits in 2013 form a sequence (0, 1, 2, 3). When did this last happen (not necessarily the same digits)?

C. The digits in 2013 form a sequence (0, 1, 2, 3). When will this next happen (not necessarily the same digits)?

 [Ref: ZWNJ] © Kevin Stone

Hint: A. goes back a few years. B. goes back hundreds of years.

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