Question: 13. Consider the following logic program: rd(cons(H, cons(H, T)), T) . rd(cons(H, T), cons(H, R)) rd(T, R) . Give a top-down derivation, showing all

13. Consider the following logic program:

rd(cons(H, cons(H, T)), T) .

rd(cons(H, T), cons(H, R)) ←

rd(T, R) .

Give a top-down derivation, showing all substitutions for the query

???????????? rd(cons

(a, cons(cons

(a, X), cons(B, cons

(c, Z)))), W) .

What is the answer corresponding to this derivation?

Is there a second answer? If yes, show the derivation; if not, explain why.

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