there exists something such that it is a English or it is nonexistent or both.
sent1: the imposter is English if something that is not a Pomacanthus is inshore. sent2: something is not a kind of a Pomacanthus but it is inshore.
sent2 & sent1 -> int1: the imposter is English.; int1 -> int2: the imposter is a kind of a English and/or is nonexistent.; int2 -> hypothesis;
$hypothesis$ = there exists something such that it is a English or it is nonexistent or both. ; $context$ = sent1: the imposter is English if something that is not a Pomacanthus is inshore. sent2: something is not a kind of a Pomacanthus but it is inshore. ; $proof$ = 
sent2 & sent1 -> int1: the imposter is English.; int1 -> int2: the imposter is a kind of a English and/or is nonexistent.; int2 -> hypothesis; __PROVED__