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We call a number peachy if every digit in the number is either a $3$ or next to a $3.$  For example, the numbers $333,$ $83,$ $303,$ and $3773$ are all peachy, but the numbers $32523,$ $786,$ $340,$ and $3999$ are not peachy.

 

How many positive $4$-digit numbers are peachy?

 
 Aug 3, 2021

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