E1:     C1 CALL pred special_term_dep.main/2-0 (det) special_term_dep.m:16
mdb> echo on
Command echo enabled.
mdb> register --quiet
mdb> break p
 0: + stop  interface pred special_term_dep.p/1-0 (det)
mdb> break q
 1: + stop  interface pred special_term_dep.q/2-0 (semidet)
mdb> continue
      E2:     C2 CALL pred special_term_dep.p/1-0 (det) special_term_dep.m:31 (special_term_dep.m:25)
mdb> finish
      E3:     C2 EXIT pred special_term_dep.p/1-0 (det) special_term_dep.m:31 (special_term_dep.m:25)
mdb> dd -d 3 -n 7
p([2, 3])
Valid? browse 1
browser> mark
pa([2, 3])
Valid? yes
Found incorrect contour:
pa([2, 3])
p([2, 3])
Is this a bug? yes
      E3:     C2 EXIT pred special_term_dep.p/1-0 (det) special_term_dep.m:31 (special_term_dep.m:25)
mdb> continue
[2, 3]
      E4:     C3 CALL pred special_term_dep.q/2-0 (semidet) special_term_dep.m:56 (special_term_dep.m:48)
mdb> finish
      E5:     C3 EXIT pred special_term_dep.q/2-0 (semidet) special_term_dep.m:56 (special_term_dep.m:48)
mdb> dd -d 3 -n 7
q([1, 2], [3])
Valid? browse 2
browser> mark
qb([1, 2], [3])
Valid? browse 1
browser> mark
qa([1, 2])
Valid? yes
Found inadmissible call:
Parent q([1, 2], _)
Call qb([1, 2], _)
Is this a bug? yes
      E5:     C3 EXIT pred special_term_dep.q/2-0 (semidet) special_term_dep.m:56 (special_term_dep.m:48)
mdb> continue
[3]