Asked by voltes v

There are two 1's, two 2's, and two 3's. There is one digit between the two 1's, there are two digits between two 2's, and there are three digits between the two 3's. Holding number cards, can you duplicate this sequence of numbers? Can you continue this pattern all the way up to two 7's?
Answered by Steve
one way is
312132
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