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66. If one of the contraries is false, then the truth value of the other is
True
False
Neither true nor false
Doubtful
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67. If one of the contradictories is true, then the other must be
68. Both the contrary propositions cannot be
True and false
69. Of two sub-contraries, if one is false, the other is necessarily
70. If one of the two sub-contraries is true, then the other one is
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