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Search options not deleted user 12399

A puzzle in which you spot the pattern that links a set of given data items (like numbers, letters, music tunes). Usually, you use your insights into the pattern to find one or more new elements of the set.

14 votes
Accepted

ALIEN Counting System

Update: To address the comment by JLee, yes, you still actually have a unique mapping of Earth numbers to Mars numbers, assuming Martians intuitively follow digit restrictions that are natural to th …
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