Remove the middle element of a vector?
[1,2,3] should return 2
[1,2,3,4] should return 2
 should return empty vector
Remove or return ?
keep it or remove it? confused example.
Remove all the words that end with "ain"
2 b | ~ 2 b
Generate a vector like 1,2,2,3,3,3,4,4,4,4
Sum the numbers on the main diagonal
Integer or Float?
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