c status 10
c --bumpreasons=0
c --failedmineff=0
c --probeinit=0
c --probeint=0
c --really=0
c --reduceinit=0
c --substitute=0
c --transitivemineff=0
c --vivifymineff=0
p cnf 19 20
-6 7 0
-7 -2 0
8 -7 0
-8 4 0
-9 17 7 0
18 13 0
11 -4 0
10 -1 -16 0
6 -11 0
6 9 0
3 -5 0
-17 -18 0
-14 2 17 0
-12 -8 0
12 5 0
-17 -9 -15 0
9 -3 0
-13 15 -17 0
-6 14 -16 0
16 -19 0