1: 1 1 CALL pred queens:main/2-0 (cc_multi) mdb> echo on Command echo enabled. mdb> print * HeadVar__1 state('<>') mdb> 2: 2 2 CALL pred queens:data/1-0 (det) mdb> print * mdb: there are no live variables. mdb> 3: 2 2 EXIT pred queens:data/1-0 (det) mdb> print * HeadVar__1 [1, 2, 3, 4, 5] mdb> 4: 3 2 CALL pred queens:queen/2-0 (nondet) mdb> print * HeadVar__1 [1, 2, 3, 4, 5] mdb> 5: 4 3 CALL pred queens:qperm/2-0 (nondet) mdb> print * HeadVar__1 [1, 2, 3, 4, 5] mdb> 6: 4 3 SWTC pred queens:qperm/2-0 (nondet) s1; mdb> print * HeadVar__1 [1, 2, 3, 4, 5] mdb> 7: 5 4 CALL pred queens:qdelete/3-0 (nondet) mdb> print * HeadVar__2 [1, 2, 3, 4, 5] mdb> 8: 5 4 DISJ pred queens:qdelete/3-0 (nondet) c2;d1; mdb> print * HeadVar__2 [1, 2, 3, 4, 5] V_11 [2, 3, 4, 5] V_12 1 mdb> level 1 1 5 4 3 pred queens:qperm/2-0 (nondet) Ancestor level set to 1. mdb> print * HeadVar__1 [1, 2, 3, 4, 5] mdb> up 1 2 4 3 2 pred queens:queen/2-0 (nondet) Ancestor level set to 2. mdb> vars 1 HeadVar__1 mdb> print * HeadVar__1 [1, 2, 3, 4, 5] mdb> 9: 5 4 EXIT pred queens:qdelete/3-0 (nondet) mdb> print HeadVar__1 HeadVar__1 1 mdb> print HeadVar__2 HeadVar__2 [1, 2, 3, 4, 5] mdb> print HeadVar__3 HeadVar__3 [2, 3, 4, 5] mdb> 10: 6 4 CALL pred queens:qperm/2-0 (nondet) mdb> print * HeadVar__1 [2, 3, 4, 5] mdb> 11: 6 4 SWTC pred queens:qperm/2-0 (nondet) s1; mdb> print * HeadVar__1 [2, 3, 4, 5] mdb> 12: 7 5 CALL pred queens:qdelete/3-0 (nondet) mdb> print * HeadVar__2 [2, 3, 4, 5] mdb> 13: 7 5 DISJ pred queens:qdelete/3-0 (nondet) c2;d1; mdb> print * HeadVar__2 [2, 3, 4, 5] V_11 [3, 4, 5] V_12 2 mdb> 14: 7 5 EXIT pred queens:qdelete/3-0 (nondet) mdb> print * HeadVar__1 2 HeadVar__2 [2, 3, 4, 5] HeadVar__3 [3, 4, 5] mdb> 15: 8 5 CALL pred queens:qperm/2-0 (nondet) mdb> goto -a 20 16: 8 5 SWTC pred queens:qperm/2-0 (nondet) s1; 17: 9 6 CALL pred queens:qdelete/3-0 (nondet) 18: 9 6 DISJ pred queens:qdelete/3-0 (nondet) c2;d1; 19: 9 6 EXIT pred queens:qdelete/3-0 (nondet) 20: 10 6 CALL pred queens:qperm/2-0 (nondet) mdb> stack 0 4* pred queens:qperm/2-0 (nondet) 4 pred queens:queen/2-0 (nondet) 5 pred queens:main/2-0 (cc_multi) mdb> stack -d 0 20 10 6 pred queens:qperm/2-0 (nondet) 1 15 8 5 pred queens:qperm/2-0 (nondet) 2 10 6 4 pred queens:qperm/2-0 (nondet) 3 5 4 3 pred queens:qperm/2-0 (nondet) 4 4 3 2 pred queens:queen/2-0 (nondet) 5 1 1 1 pred queens:main/2-0 (cc_multi) mdb> print * HeadVar__1 [4, 5] mdb> 21: 10 6 SWTC pred queens:qperm/2-0 (nondet) s1; mdb> retry 34: 10 6 EXIT pred queens:qperm/2-0 (nondet) 20: 10 6 CALL pred queens:qperm/2-0 (nondet) mdb> print * HeadVar__1 [4, 5] mdb> finish -a 21: 10 6 SWTC pred queens:qperm/2-0 (nondet) s1; 22: 11 7 CALL pred queens:qdelete/3-0 (nondet) 23: 11 7 DISJ pred queens:qdelete/3-0 (nondet) c2;d1; 24: 11 7 EXIT pred queens:qdelete/3-0 (nondet) 25: 12 7 CALL pred queens:qperm/2-0 (nondet) 26: 12 7 SWTC pred queens:qperm/2-0 (nondet) s1; 27: 13 8 CALL pred queens:qdelete/3-0 (nondet) 28: 13 8 DISJ pred queens:qdelete/3-0 (nondet) c2;d1; 29: 13 8 EXIT pred queens:qdelete/3-0 (nondet) 30: 14 8 CALL pred queens:qperm/2-0 (nondet) 31: 14 8 SWTC pred queens:qperm/2-0 (nondet) s2; 32: 14 8 EXIT pred queens:qperm/2-0 (nondet) 33: 12 7 EXIT pred queens:qperm/2-0 (nondet) 34: 10 6 EXIT pred queens:qperm/2-0 (nondet) mdb> register --quiet mdb> break print_list 0: + stop interface pred queens:print_list/3-0 (det) mdb> break qdelete 1: + stop interface pred queens:qdelete/3-0 (nondet) mdb> continue -a 35: 8 5 EXIT pred queens:qperm/2-0 (nondet) 36: 6 4 EXIT pred queens:qperm/2-0 (nondet) 37: 4 3 EXIT pred queens:qperm/2-0 (nondet) 38: 15 3 CALL pred queens:safe/1-0 (semidet) 39: 15 3 SWTC pred queens:safe/1-0 (semidet) s1; 40: 16 4 CALL pred queens:nodiag/3-0 (semidet) 41: 16 4 SWTC pred queens:nodiag/3-0 (semidet) s1; 42: 16 4 THEN pred queens:nodiag/3-0 (semidet) s1;c4;t; 43: 16 4 FAIL pred queens:nodiag/3-0 (semidet) 44: 15 3 FAIL pred queens:safe/1-0 (semidet) 45: 4 3 REDO pred queens:qperm/2-0 (nondet) 46: 6 4 REDO pred queens:qperm/2-0 (nondet) 47: 8 5 REDO pred queens:qperm/2-0 (nondet) 48: 10 6 REDO pred queens:qperm/2-0 (nondet) 49: 12 7 REDO pred queens:qperm/2-0 (nondet) 50: 14 8 REDO pred queens:qperm/2-0 (nondet) 51: 14 8 FAIL pred queens:qperm/2-0 (nondet) 52: 13 8 REDO pred queens:qdelete/3-0 (nondet) mdb> step -aS 5 53: 13 8 DISJ pred queens:qdelete/3-0 (nondet) c2;d2; 54: 17 9 CALL pred queens:qdelete/3-0 (nondet) 55: 17 9 FAIL pred queens:qdelete/3-0 (nondet) 56: 13 8 FAIL pred queens:qdelete/3-0 (nondet) 57: 12 7 FAIL pred queens:qperm/2-0 (nondet) mdb> disable 1 1: - stop interface pred queens:qdelete/3-0 (nondet) mdb> continue -n 675: 141 2 CALL pred queens:print_list/3-0 (det) mdb> continue -n -S [1, 3, 5, 2, 4]