The Principle of Excluded Middle 

The law of excluded middle can be expressed by the propositional formula ___ ____ _________ ____ ____ ___ __________.
___ ________ ______ ______ __________ __________ ________ _____ ________ _______.
__________ _______ ___ __________ ________ _________ _______ __________ ___ _________.
_________ ______ ___ ______ ___ ________ _______ _____ ____ ______.
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