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A competition to solve a particular problem through the usage and manipulation of arrays.
2
votes
Non-Unique/Duplicate Elements
Common Lisp, 57 bytes
(remove-duplicates(remove-if(lambda(x)(<(count x d)2))d))
0
votes
Lisp Extraction Mission
Common Lisp, 168 155 bytes
Some stupid recursion thing, it could probably be condensed a bit more:
(lambda(l e)(labels((r(l o)(setf a(car l)d(cdr l)x`(car,o)y`(cdr,o))(if(equal e a)x(if(atom a)(r d y) …