the fact that the tetroxide does branch radiochemistry if the tetroxide is penetrable does not hold.
sent1: the tetroxide is not penetrable if it does not branch radiochemistry. sent2: if the tetroxide does not branch radiochemistry then it is penetrable. sent3: the daggerboard is penetrable. sent4: if the tetroxide is non-nosocomial then the sweetbread is a kind of penetrable thing that branches radiochemistry. sent5: if that the tetroxide branches radiochemistry is right it is not penetrable.
void -> assump1: Let's assume that the tetroxide does not branch radiochemistry.; sent1 & assump1 -> int1: the tetroxide is not penetrable.; void -> assump2: Let's assume that the tetroxide is penetrable.; int1 & assump2 -> int2: this is contradiction.; [assump1] & int2 -> int3: the tetroxide does branch radiochemistry.; [assump2] & int3 -> hypothesis;
the sweetbread branches radiochemistry.
$hypothesis$ = the fact that the tetroxide does branch radiochemistry if the tetroxide is penetrable does not hold. ; $context$ = sent1: the tetroxide is not penetrable if it does not branch radiochemistry. sent2: if the tetroxide does not branch radiochemistry then it is penetrable. sent3: the daggerboard is penetrable. sent4: if the tetroxide is non-nosocomial then the sweetbread is a kind of penetrable thing that branches radiochemistry. sent5: if that the tetroxide branches radiochemistry is right it is not penetrable. ; $proof$ = 
void -> assump1: Let's assume that the tetroxide does not branch radiochemistry.; sent1 & assump1 -> int1: the tetroxide is not penetrable.; void -> assump2: Let's assume that the tetroxide is penetrable.; int1 & assump2 -> int2: this is contradiction.; [assump1] & int2 -> int3: the tetroxide does branch radiochemistry.; [assump2] & int3 -> hypothesis; __DISPROVED__