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Create a recursive Prolog predicate listlength/2 that has a list as its first argument, and the length of that list as its second argument. Examples:
Create a recursive Prolog predicate listlength/2 that has a list as its first argument, and the length of that list as its second argument.
Examples:
?- listlength([9, 5, 6, 4],L).
L = 4.
?- listlength([], 0).
true.
?- listlength(List, 0).
List = [].
?- listlength([5, [6, 7, 8]], L).
L = 2.
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