Counting Sublist Elements in Prolog?

Len(H|T,N) :- len(H, LH), len(T, LT),! , N is LH + LT. Len(, 0):-!.

Len(_, 1):-! Test:? - len(a,b,c,d,e,f,Output).

Output = 6.

Len(H|T,N) :- len(H, LH), len(T, LT),! , N is LH + LT. Len(, 0):-!.

Len(_, 1):-!. Test:? - len(a,b,c,d,e,f,Output).

Output = 6.

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