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5.38.17  Prepend an element at the beginning of a list : prepend

prepend takes as argument a list and an element.
prepend puts this element at the beginning of this list.
Input :

prepend([3,4,2],1)

Output :

[1,3,4,2]

Input :

prepend([1,2],[3,4])

Output :

[[3,4],1,2]

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