Question: ( * * [ sub l 1 l 2 ] returns the list resulting from subtracting every element in [ l 2 ] from [

(**[sub l1 l2] returns the list resulting from subtracting every
element in [l2] from [l1].
Eg. sub [1;2][]=>[1; 2]
Eg. sub [1;2;1][1]=>[2]
Eg. sub [1;2][2;3;1]=>[]

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