the bistro does propitiate.
sent1: everything is not a kind of a combustion and is not tactless. sent2: if the Aramean is chaetal the bistro is medullary. sent3: something does propitiate if it is not a combustion and not tactless. sent4: if something is not endoparasitic then it does not propitiate and is not chaetal.
sent3 -> int1: the bistro propitiates if it is not a kind of a combustion and it is not tactless.; sent1 -> int2: the bistro is not a combustion and it is not tactless.; int1 & int2 -> hypothesis;
the bistro does not propitiate.
sent4 -> int3: if the Aramean is not endoparasitic it does not propitiate and it is not chaetal.;
$hypothesis$ = the bistro does propitiate. ; $context$ = sent1: everything is not a kind of a combustion and is not tactless. sent2: if the Aramean is chaetal the bistro is medullary. sent3: something does propitiate if it is not a combustion and not tactless. sent4: if something is not endoparasitic then it does not propitiate and is not chaetal. ; $proof$ = 
sent3 -> int1: the bistro propitiates if it is not a kind of a combustion and it is not tactless.; sent1 -> int2: the bistro is not a combustion and it is not tactless.; int1 & int2 -> hypothesis; __PROVED__