Consider the following first-order definite rules, which are all universally quantified in terms of the variable x:

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Consider the following first-order definite rules, which are all universally quantified in terms of the variable x:

A(x) ⇒ B(x)

B(x) ⇒ C(x)

B(x) ∧ C(x) ⇒ D(x)

Suppose that the statement A(John) is true. Use forward chaining to show that D(John) is also true.

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