Question: 1 Show that this argument form is valid. The argument (x1 x2) (x3 x4) (x1 x3) (x2 x4)

1 Show that this argument form is valid.

The argument (x1 → x2) ∧
(x3 → x4) ∧ (x1 ∨ x3) → (x2 ∨ x4) is given.

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