Question: 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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