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NOT.(.TRUE.OR.TRUE.AND..FALSE.) NOT..FALSE..AND..FALSE. NOT.(.TRUE..AND..FALSE.) NOT.FALSE.AND.TRUE.EQV.FALSE.
must be true can't be true may not be true is true
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.NOT.(.TRUE..OR..TRUE..AND..FALSE.) .NOT..FALSE..AND..FALSE. .NOT.(.TRUE..AND..FALSE.) .NOT..FALSE..AND..TRUE..EQV..FALSE.
real ; real true; true real; true true; real
be come true; is true to come true; is true of realize; is true for be realized; is true to
a=true b=false b=true c=false a=true b=false b=true c=true a=true b=true b=true c=false a=false b=false b=true c=false
若a=True b=True 则 a or b ==True 若a=True b=False 则 a or b ==True 若a=True b=True 则 a or b ==False 若a=False b=False 则 a or b ==False
Was it true Is it true It is true It was true
Was that true If that was true Should that be true Could that be true
a=true b=false b=true c=false a=true b=false b=true c=true a=true b=true b=true c=false a=false b=false b=true c=false
Was it true Is it true It is true It was true
a=true b=false b=true c=false a=true b=false b=true c=true a=true b=true b=true c=false a=false b=false b=true c=false
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false or not true true or not true false and not true true and not true