1:      1  1 CALL pred family.main/2-0 (det) family.m:14
mdb> echo on
Command echo enabled.
mdb> register --quiet
mdb> break half_siblings
 0: + stop  interface pred family.half_siblings/2-0 (nondet)
mdb> continue
       3:      2  2 CALL pred family.half_siblings/2-0 (nondet) family.m:83 (family.m:15)
mdb> finish
     268:      2  2 EXIT pred family.half_siblings/2-0 (nondet) family.m:83 (family.m:15)
mdb> dd -d 3 -n 7
half_siblings(a, b)
Valid? no
siblings(a, b)
Valid? yes
Call full_siblings(_, _)
Unsatisfiable? no
common_mother(a, b)
Valid? yes
Call common_father(_, _)
Unsatisfiable? no
parent(m, a)
Valid? yes
Call parent(a, _)
Unsatisfiable? yes
parent(m, b)
Valid? yes
Call parent(b, _)
Unsatisfiable? yes
parent(f, a)
Valid? yes
parent(f, b)
Valid? yes
parent(f, c)
Valid? yes
Call parent(c, _)
Unsatisfiable? yes
parent(s, c)
Valid? yes
Call parent(_, _)
Solutions:
	parent(m, a)
	parent(m, b)
	parent(f, a)
	parent(f, b)
	parent(f, c)
	parent(s, c)
Complete? yes
Found partially uncovered atom:
common_father(_, _)
Is this a bug? yes
      86:     15  4 FAIL pred family.common_father/2-0 (nondet) family.m:62 (family.m:79)
mdb> continue
     268:      2  2 EXIT pred family.half_siblings/2-0 (nondet) family.m:83 (family.m:15)
mdb> continue
     269:      2  2 REDO pred family.half_siblings/2-0 (nondet) family.m:83 (family.m:15)
mdb> finish
     530:      2  2 EXIT pred family.half_siblings/2-0 (nondet) family.m:83 (family.m:15)
mdb> dd -d 3 -n 7
half_siblings(b, a)
Valid? no
Found partially uncovered atom:
common_father(_, _)
Is this a bug? yes
     348:     59  4 FAIL pred family.common_father/2-0 (nondet) family.m:62 (family.m:79)
mdb> continue
     530:      2  2 EXIT pred family.half_siblings/2-0 (nondet) family.m:83 (family.m:15)
mdb> continue
     531:      2  2 REDO pred family.half_siblings/2-0 (nondet) family.m:83 (family.m:15)
mdb> finish
     695:      2  2 FAIL pred family.half_siblings/2-0 (nondet) family.m:83 (family.m:15)
mdb> dd -d 3 -n 7
Call half_siblings(_, _)
Solutions:
	half_siblings(a, b)
	half_siblings(b, a)
Complete? no
siblings(b, a)
Valid? yes
Call siblings(_, _)
Solutions:
	siblings(a, b)
	siblings(b, a)
Complete? no
Found partially uncovered atom:
common_father(_, _)
Is this a bug? yes
     693:    110  4 FAIL pred family.common_father/2-0 (nondet) family.m:62 (family.m:73)
mdb> quit -y