there exists something such that if the fact that it is not a threadfish and/or it is a kind of a Eurasian is not true then it is a kind of a memsahib.
sent1: something is a memsahib if it is not a threadfish and/or it is a kind of a Eurasian. sent2: something is a memsahib if that either it is not a kind of a threadfish or it is Eurasian or both is incorrect. sent3: if that the ergotamine does not parse squirrelfish and/or is a kind of an extremist is not false it parses immateriality. sent4: something is pleochroic if the fact that it is not careless or it is catadromous or both is not correct.
sent2 -> int1: if the fact that the ergotamine is either not a threadfish or Eurasian or both is wrong it is a memsahib.; int1 -> hypothesis;
there exists something such that if that it is not careless and/or it is catadromous does not hold then it is pleochroic.
sent4 -> int2: if that the valuer is not careless or it is catadromous or both is wrong then it is pleochroic.; int2 -> hypothesis;
$hypothesis$ = there exists something such that if the fact that it is not a threadfish and/or it is a kind of a Eurasian is not true then it is a kind of a memsahib. ; $context$ = sent1: something is a memsahib if it is not a threadfish and/or it is a kind of a Eurasian. sent2: something is a memsahib if that either it is not a kind of a threadfish or it is Eurasian or both is incorrect. sent3: if that the ergotamine does not parse squirrelfish and/or is a kind of an extremist is not false it parses immateriality. sent4: something is pleochroic if the fact that it is not careless or it is catadromous or both is not correct. ; $proof$ = 
sent2 -> int1: if the fact that the ergotamine is either not a threadfish or Eurasian or both is wrong it is a memsahib.; int1 -> hypothesis; __PROVED__