Question: Consider the following Prolog code. p ( 1 ) . q ( 2 ) . Why does the query ? - + (

Consider the following Prolog code.
p(1).
q(2).
Why does the query ?-\+(\+ p(X)), q(X). succeed?
The corresponding predicate calculus formula is true.
The two X's in the query are different variables.
The variable X is not bound to 1.

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