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