if that the friendly does not occur is not false either the vengeance does not occur or the parching delighted occurs or both.
sent1: the vengeance does not occur if not the parching Landsteiner but the friendly occurs. sent2: if the parching Landsteiner does not occur and the friendly does not occur the vengeance does not occur. sent3: either the vengeance happens or the parching delighted happens or both.
$hypothesis$ = if that the friendly does not occur is not false either the vengeance does not occur or the parching delighted occurs or both. ; $context$ = sent1: the vengeance does not occur if not the parching Landsteiner but the friendly occurs. sent2: if the parching Landsteiner does not occur and the friendly does not occur the vengeance does not occur. sent3: either the vengeance happens or the parching delighted happens or both. ; $proof$ = 
__UNKNOWN__