Create the and/or graph for the following problem. Why is it impossible to conclude the goal: r(Z)

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Create the and/or graph for the following problem. Why is it impossible to conclude the goal:
r(Z) ∨ s(Z)?
Fact: p(X) ∨ q(X).
Rules: p(a) → r(a) and q(b) → s(b).

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