the ultrasound does not occur.
sent1: the univalentness occurs if the blistering catarrh does not occur. sent2: the blistering NLRB does not occur if the blistering NLRB does not occur or the univalentness occurs or both. sent3: the univalentness does not occur and the diving climber does not occur. sent4: the blistering catarrh does not occur if that the marriage happens but the diving hospital does not occur is incorrect. sent5: that the marriage happens but the diving hospital does not occur prevents that the ultrasound happens.
void -> assump1: Let's assume that the fact that that the marriage occurs but the diving hospital does not occur is correct is not right.; sent4 & assump1 -> int1: the blistering catarrh does not occur.; int1 & sent1 -> int2: the univalentness occurs.; sent3 -> int3: the univalentness does not occur.; int2 & int3 -> int4: this is contradiction.; [assump1] & int4 -> int5: the marriage but not the diving hospital happens.; int5 & sent5 -> hypothesis;
the fact that the blistering NLRB does not occur is correct.
$hypothesis$ = the ultrasound does not occur. ; $context$ = sent1: the univalentness occurs if the blistering catarrh does not occur. sent2: the blistering NLRB does not occur if the blistering NLRB does not occur or the univalentness occurs or both. sent3: the univalentness does not occur and the diving climber does not occur. sent4: the blistering catarrh does not occur if that the marriage happens but the diving hospital does not occur is incorrect. sent5: that the marriage happens but the diving hospital does not occur prevents that the ultrasound happens. ; $proof$ = 
void -> assump1: Let's assume that the fact that that the marriage occurs but the diving hospital does not occur is correct is not right.; sent4 & assump1 -> int1: the blistering catarrh does not occur.; int1 & sent1 -> int2: the univalentness occurs.; sent3 -> int3: the univalentness does not occur.; int2 & int3 -> int4: this is contradiction.; [assump1] & int4 -> int5: the marriage but not the diving hospital happens.; int5 & sent5 -> hypothesis; __PROVED__