c quinn.cnf c p cnf 16 18 1 2 0 -2 -4 0 3 4 0 -4 -5 0 5 -6 0 6 -7 0 6 7 0 7 -16 0 8 -9 0 -8 -14 0 9 10 0 9 -10 0 -10 -11 0 10 12 0 11 12 0 13 14 0 14 -15 0 15 16 0