int knot[6][6] = {knot[1][2] = knot[2][1] = 3,knot[1][4] = knot[4][1] = 5, knot[2][4] = knot[4][2] = 1, knot[2][3] = knot[3][2] = 6, knot[4][3] = knot[3][4] = 3, knot[4][5] = knot[5][4] = 1, knot[3][5] = knot[5][3] = 1, knot[3][6] = knot[6][3] = 3, knot[5][6] = knot[6][5] = 6 };