#32
Duplicate a Sequence
 

Difficulty:Easy
Topics:seqs


Write a function which duplicates each element of a sequence.
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(= (__ [1 2 3]) '(1 1 2 2 3 3))
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(= (__ [:a :a :b :b]) '(:a :a :a :a :b :b :b :b))
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(= (__ [[1 2] [3 4]]) '([1 2] [1 2] [3 4] [3 4]))
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(= (__ [[1 2] [3 4]]) '([1 2] [1 2] [3 4] [3 4]))


Code which fills in the blank: