the Ovulen is a kind of a lac.
sent1: if the fact that the stammerer does not clue catboat is true the clocksmith is not a kind of a Rigel and it is not a screwdriver. sent2: the stammerer is bisontine if there is something such that the fact that the fact that it is metallic but not a repertoire is not false does not hold. sent3: if something is not a Rigel and it is not a kind of a screwdriver then the Ovulen is a lac. sent4: if something clues catboat that it is bisontine is false. sent5: there is something such that that it is a kind of a metallic and it is not a repertoire does not hold.
sent4 -> int1: if that the stammerer clues catboat is not incorrect then it is not bisontine.; void -> assump1: Let's assume that the stammerer does clue catboat.; int1 & assump1 -> int2: the stammerer is not bisontine.; sent5 & sent2 -> int3: the stammerer is bisontine.; int2 & int3 -> int4: this is contradiction.; [assump1] & int4 -> int5: the stammerer does not clue catboat.; int5 & sent1 -> int6: the clocksmith is not a kind of a Rigel and it is not a screwdriver.; int6 -> int7: something is not a Rigel and it is not a screwdriver.; int7 & sent3 -> hypothesis;
$hypothesis$ = the Ovulen is a kind of a lac. ; $context$ = sent1: if the fact that the stammerer does not clue catboat is true the clocksmith is not a kind of a Rigel and it is not a screwdriver. sent2: the stammerer is bisontine if there is something such that the fact that the fact that it is metallic but not a repertoire is not false does not hold. sent3: if something is not a Rigel and it is not a kind of a screwdriver then the Ovulen is a lac. sent4: if something clues catboat that it is bisontine is false. sent5: there is something such that that it is a kind of a metallic and it is not a repertoire does not hold. ; $proof$ = 
sent4 -> int1: if that the stammerer clues catboat is not incorrect then it is not bisontine.; void -> assump1: Let's assume that the stammerer does clue catboat.; int1 & assump1 -> int2: the stammerer is not bisontine.; sent5 & sent2 -> int3: the stammerer is bisontine.; int2 & int3 -> int4: this is contradiction.; [assump1] & int4 -> int5: the stammerer does not clue catboat.; int5 & sent1 -> int6: the clocksmith is not a kind of a Rigel and it is not a screwdriver.; int6 -> int7: something is not a Rigel and it is not a screwdriver.; int7 & sent3 -> hypothesis; __PROVED__