(P) | (Q) | (R) | (S) |
True | True | False | False |
(P) | (Q) | (R) | (S) |
True | True | False | True |
(P) | (Q) | (R) | (S) |
False | True | False | True |
(P) | (Q) | (R) | (S) |
False | False | True | True |
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