theorem Th97: :: GFACIRC1:97

for x, y, z being set st z <> [<*x,y*>,xor2c] & x <> [<*y,z*>,and2c] & y <> [<*z,x*>,nor2] & z <> [<*x,y*>,and2a] holds
InputVertices (BitGFA2Str (x,y,z)) = {x,y,z}