the helpmate is natural.
sent1: the helpmate is a natural if it begins. sent2: the thunderstorm does begin. sent3: the helpmate is gluteal. sent4: the helpmate begins if it is gluteal.
sent4 & sent3 -> int1: the helpmate begins.; int1 & sent1 -> hypothesis;
$hypothesis$ = the helpmate is natural. ; $context$ = sent1: the helpmate is a natural if it begins. sent2: the thunderstorm does begin. sent3: the helpmate is gluteal. sent4: the helpmate begins if it is gluteal. ; $proof$ = 
sent4 & sent3 -> int1: the helpmate begins.; int1 & sent1 -> hypothesis; __PROVED__