there exists something such that if it is not a kind of a blacktail it is mucinous.
sent1: if the bridle is not a blacktail then it is mucinous.
sent1 -> hypothesis;
$hypothesis$ = there exists something such that if it is not a kind of a blacktail it is mucinous. ; $context$ = sent1: if the bridle is not a blacktail then it is mucinous. ; $proof$ = 
sent1 -> hypothesis; __PROVED__