Well formulated formula?

Logic Level 1

According to propositional logic, which of the following is not a well formulated formula?

(1): (AB)(CD)A \wedge B) \to (C \vee D)
(2): (A¬B)(CD)A \neg B) \to (C \vee D)
(3): (AB)(¬D)A \leftrightarrow B) \to (\neg D)

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