1:      1  1 CALL pred queens:main/2-0 (cc_multi) 
mdb> echo on
Command echo enabled.
mdb> dd_wrong
mdb: wrong answer analysis is only available from EXIT events.
mdb> goto 6
       6:      4  3 SWTC pred queens:qperm/2-0 (nondet) s1;
mdb> dd_wrong
mdb: wrong answer analysis is only available from EXIT events.
mdb> goto 8
       8:      5  4 DISJ pred queens:qdelete/3-0 (nondet) c2;d1;
mdb> dd_wrong
mdb: wrong answer analysis is only available from EXIT events.
mdb> goto 43
      43:     16  4 FAIL pred queens:nodiag/3-0 (semidet) 
mdb> dd_wrong
mdb: wrong answer analysis is only available from EXIT events.
mdb> goto 673
     673:      3  2 EXIT pred queens:queen/2-0 (nondet) 
mdb> dd_wrong
queen([1, 2, 3, 4, 5], [1, 3, 5, 2, 4])
Valid? n
safe([1, 3, 5, 2, 4])
Valid? n
safe([3, 5, 2, 4])
Valid? n
safe([5, 2, 4])
Valid? n
safe([2, 4])
Valid? n
safe([4])
Valid? n
safe([])
Valid? n
Incorrect instance found:

safe([]).

     673:      3  2 EXIT pred queens:queen/2-0 (nondet) 
mdb> dd_wrong
queen([1, 2, 3, 4, 5], [1, 3, 5, 2, 4])
Valid? n
safe([1, 3, 5, 2, 4])
Valid? n
safe([3, 5, 2, 4])
Valid? n
safe([5, 2, 4])
Valid? n
safe([2, 4])
Valid? n
safe([4])
Valid? y
nodiag(2, 1, [4])
Valid? y
Incorrect instance found:

safe([2, 4]) :-
	nodiag(2, 1, [4]),
	safe([4]).

     673:      3  2 EXIT pred queens:queen/2-0 (nondet) 
mdb> dd_wrong
queen([1, 2, 3, 4, 5], [1, 3, 5, 2, 4])
Valid? n
safe([1, 3, 5, 2, 4])
Valid? n
safe([3, 5, 2, 4])
Valid? y
nodiag(1, 1, [3, 5, 2, 4])
Valid? n
nodiag(1, 2, [5, 2, 4])
Valid? n
nodiag(1, 3, [2, 4])
Valid? y
Incorrect instance found:

nodiag(1, 2, [5, 2, 4]) :-
	nodiag(1, 3, [2, 4]).

     673:      3  2 EXIT pred queens:queen/2-0 (nondet) 
mdb> dd_wrong
queen([1, 2, 3, 4, 5], [1, 3, 5, 2, 4])
Valid? n
safe([1, 3, 5, 2, 4])
Valid? n
safe([3, 5, 2, 4])
Valid? y
nodiag(1, 1, [3, 5, 2, 4])
Valid? y
Incorrect instance found:

safe([1, 3, 5, 2, 4]) :-
	nodiag(1, 1, [3, 5, 2, 4]),
	safe([3, 5, 2, 4]).

     673:      3  2 EXIT pred queens:queen/2-0 (nondet) 
mdb> continue -a
     674:      1  1 THEN pred queens:main/2-0 (cc_multi) t;
     675:    141  2 CALL pred queens:print_list/3-0 (det) 
     676:    141  2 ELSE pred queens:print_list/3-0 (det) e;
[     677:    142  3 CALL pred queens:print_list_2/3-0 (det) 
     678:    142  3 SWTC pred queens:print_list_2/3-0 (det) s1;
1     679:    142  3 ELSE pred queens:print_list_2/3-0 (det) s1;c3;e;
,      680:    143  4 CALL pred queens:print_list_2/3-0 (det) 
     681:    143  4 SWTC pred queens:print_list_2/3-0 (det) s1;
3     682:    143  4 ELSE pred queens:print_list_2/3-0 (det) s1;c3;e;
,      683:    144  5 CALL pred queens:print_list_2/3-0 (det) 
     684:    144  5 SWTC pred queens:print_list_2/3-0 (det) s1;
5     685:    144  5 ELSE pred queens:print_list_2/3-0 (det) s1;c3;e;
,      686:    145  6 CALL pred queens:print_list_2/3-0 (det) 
     687:    145  6 SWTC pred queens:print_list_2/3-0 (det) s1;
2     688:    145  6 ELSE pred queens:print_list_2/3-0 (det) s1;c3;e;
,      689:    146  7 CALL pred queens:print_list_2/3-0 (det) 
     690:    146  7 SWTC pred queens:print_list_2/3-0 (det) s1;
4     691:    146  7 THEN pred queens:print_list_2/3-0 (det) s1;c3;t;
     692:    146  7 EXIT pred queens:print_list_2/3-0 (det) 
     693:    145  6 EXIT pred queens:print_list_2/3-0 (det) 
     694:    144  5 EXIT pred queens:print_list_2/3-0 (det) 
     695:    143  4 EXIT pred queens:print_list_2/3-0 (det) 
     696:    142  3 EXIT pred queens:print_list_2/3-0 (det) 
]
     697:    141  2 EXIT pred queens:print_list/3-0 (det) 
     698:      1  1 EXIT pred queens:main/2-0 (cc_multi)