puresat-0.1: dimacs/pret/pret60_60.cnf
c File: pret60_60.cnf
c
c SOURCE: Daniel Pretolani (daniele@crt.umontreal.ca)
c
c DESCRIPTION: Unsatisfiable instances of a graph 2-coloring with
c parity constraints.
c
c ----------- DIMACS Challenge - CNF format -----------
c
c TRISAT Generator (Pretolani 1990)
c
c (Even) number of nodes ==> 40
c Charge ( 0 = sat. / 1 = unsat. ) ==> 1
c Horn Percentage (min -> 25; max -> 75) ==> 60
c Number of Propositional variables ==> 60
c Number of Clauses ==> 160
c Nodes with Charge = 1 ==> 29
c Horn Percentage (exact) ==> 57.000
c
c -----------------------------------------------------
p cnf 60 160
-3 -2 -1 0
3 2 -1 0
2 1 -3 0
3 1 -2 0
-6 -5 -4 0
6 5 -4 0
5 4 -6 0
6 4 -5 0
-9 -8 -7 0
9 8 -7 0
8 7 -9 0
9 7 -8 0
-12 -11 -10 0
12 11 -10 0
11 10 -12 0
12 10 -11 0
-15 -14 -13 0
15 14 -13 0
14 13 -15 0
15 13 -14 0
-18 -17 -16 0
18 17 -16 0
17 16 -18 0
18 16 -17 0
-21 -20 -19 0
21 20 -19 0
20 19 -21 0
21 19 -20 0
-24 -23 -22 0
24 23 -22 0
23 22 -24 0
24 22 -23 0
-27 -26 -25 0
27 26 -25 0
26 25 -27 0
27 25 -26 0
-30 -29 -28 0
30 29 -28 0
29 28 -30 0
30 28 -29 0
-33 -32 -31 0
33 32 -31 0
32 31 -33 0
33 31 -32 0
36 35 34 0
36 -35 -34 0
35 -36 -34 0
34 -36 -35 0
39 38 37 0
39 -38 -37 0
38 -39 -37 0
37 -39 -38 0
40 37 16 0
40 -37 -16 0
37 -40 -16 0
16 -40 -37 0
42 41 15 0
42 -41 -15 0
41 -42 -15 0
15 -42 -41 0
43 41 14 0
43 -41 -14 0
41 -43 -14 0
14 -43 -41 0
44 18 10 0
44 -18 -10 0
18 -44 -10 0
10 -44 -18 0
44 17 13 0
44 -17 -13 0
17 -44 -13 0
13 -44 -17 0
46 45 6 0
46 -45 -6 0
45 -46 -6 0
6 -46 -45 0
45 22 5 0
45 -22 -5 0
22 -45 -5 0
5 -45 -22 0
48 47 21 0
48 -47 -21 0
47 -48 -21 0
21 -48 -47 0
47 46 20 0
47 -46 -20 0
46 -47 -20 0
20 -47 -46 0
49 24 1 0
49 -24 -1 0
24 -49 -1 0
1 -49 -24 0
49 23 19 0
49 -23 -19 0
23 -49 -19 0
19 -49 -23 0
51 50 9 0
51 -50 -9 0
50 -51 -9 0
9 -51 -50 0
50 28 8 0
50 -28 -8 0
28 -50 -8 0
8 -50 -28 0
52 42 27 0
52 -42 -27 0
42 -52 -27 0
27 -52 -42 0
52 51 26 0
52 -51 -26 0
51 -52 -26 0
26 -52 -51 0
53 30 4 0
53 -30 -4 0
30 -53 -4 0
4 -53 -30 0
53 29 25 0
53 -29 -25 0
29 -53 -25 0
25 -53 -29 0
55 54 12 0
55 -54 -12 0
54 -55 -12 0
12 -55 -54 0
54 34 11 0
54 -34 -11 0
34 -54 -11 0
11 -54 -34 0
56 48 33 0
56 -48 -33 0
48 -56 -33 0
33 -56 -48 0
56 55 32 0
56 -55 -32 0
55 -56 -32 0
32 -56 -55 0
57 36 7 0
57 -36 -7 0
36 -57 -7 0
7 -57 -36 0
57 35 31 0
57 -35 -31 0
35 -57 -31 0
31 -57 -35 0
59 58 3 0
59 -58 -3 0
58 -59 -3 0
3 -59 -58 0
58 40 2 0
58 -40 -2 0
40 -58 -2 0
2 -58 -40 0
60 43 39 0
60 -43 -39 0
43 -60 -39 0
39 -60 -43 0
60 59 38 0
60 -59 -38 0
59 -60 -38 0
38 -60 -59 0
0