theorem Th81: :: GFACIRC1:81

for x, y, z being set st x <> [<*y,z*>,and2c] & y <> [<*z,x*>,nor2] & z <> [<*x,y*>,and2a] holds
( x in InputVertices (GFA2CarryStr (x,y,z)) & y in InputVertices (GFA2CarryStr (x,y,z)) & z in InputVertices (GFA2CarryStr (x,y,z)) )