the fact that there exists something such that if it exults and it is non-immutable it is not citric is not false.
sent1: if something exults but it is not immutable then it is not non-citric. sent2: the handicraft is not citric if it exults and it is immutable. sent3: something is not a kind of a curbstone if it is a kind of a sage and is not Romans. sent4: if something that does exult is not immutable it is not citric.
sent4 -> int1: the handicraft is non-citric if it does exult and is not immutable.; int1 -> hypothesis;
$hypothesis$ = the fact that there exists something such that if it exults and it is non-immutable it is not citric is not false. ; $context$ = sent1: if something exults but it is not immutable then it is not non-citric. sent2: the handicraft is not citric if it exults and it is immutable. sent3: something is not a kind of a curbstone if it is a kind of a sage and is not Romans. sent4: if something that does exult is not immutable it is not citric. ; $proof$ = 
sent4 -> int1: the handicraft is non-citric if it does exult and is not immutable.; int1 -> hypothesis; __PROVED__