the chicken does not occur.
sent1: if that the seigneury does not occur and the cambering does not occur hold the chicken does not occur. sent2: if the seigneury happens the trephination occurs. sent3: if the vibrionicness does not occur then the trephination does not occur and the subclavianness does not occur. sent4: if the trephination happens then the chicken happens. sent5: both the camber and the seigneury happens.
sent5 -> int1: the seigneury happens.; sent2 & int1 -> int2: the trephination happens.; sent4 & int2 -> hypothesis;
the fact that the chicken does not occur is not wrong.
$hypothesis$ = the chicken does not occur. ; $context$ = sent1: if that the seigneury does not occur and the cambering does not occur hold the chicken does not occur. sent2: if the seigneury happens the trephination occurs. sent3: if the vibrionicness does not occur then the trephination does not occur and the subclavianness does not occur. sent4: if the trephination happens then the chicken happens. sent5: both the camber and the seigneury happens. ; $proof$ = 
sent5 -> int1: the seigneury happens.; sent2 & int1 -> int2: the trephination happens.; sent4 & int2 -> hypothesis; __DISPROVED__