If it is false that "All cats are mammals," then the proposition "Some cats are not mammals" must be:
If it is true that "Some dogs are collies," then the proposition "Some dogs are not collies" must be:
If it is false that "All jabberwockies are slithy toads," then the proposition "Some jabberwockies are slithy toads" must be:
If it is true that "All banshees are screeching ghosts," then the proposition "No banshees are screeching ghosts" must be:
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