theorem :: GFACIRC1:134

for x, y, z being set st z <> [<*x,y*>,xor2] & x <> [<*y,z*>,nor2] & y <> [<*z,x*>,nor2] & z <> [<*x,y*>,nor2] holds
( x in InputVertices (BitGFA3Str (x,y,z)) & y in InputVertices (BitGFA3Str (x,y,z)) & z in InputVertices (BitGFA3Str (x,y,z)) )