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Expression evaluation.....
A expression tree has one of the following forms with corresponding values: 1. number(N) where N is a number, with value N. 2. var(V) where V is a Prolog atom. Its value given a list Env of bindings is Z iff binding(V, Z) is a member of Env. 3. binop(Op, Exp1, Exp2) where Op is one...
