that there is something such that if it does alternate and/or it is a racket it does not manhandle helmeted is not right.
sent1: the fact that the periosteum does not manhandle helmeted is right if it alternates and/or it is a racket. sent2: if the periosteum manhandles helmeted then it is not intralinguistic.
sent1 -> hypothesis;
$hypothesis$ = that there is something such that if it does alternate and/or it is a racket it does not manhandle helmeted is not right. ; $context$ = sent1: the fact that the periosteum does not manhandle helmeted is right if it alternates and/or it is a racket. sent2: if the periosteum manhandles helmeted then it is not intralinguistic. ; $proof$ = 
sent1 -> hypothesis; __DISPROVED__