IndexError

Level 1 of the Dungeon
(0, 0, D:1)
  a +0 robe
(6, -6, D:1)
  a rat skeleton
(12, 24, D:1)
  a +0 quarterstaff
(15, 8, D:1)
  a +0 dagger
  a goblin corpse (skeletalised by now)
(16, 30, D:1)
  a +0 sling
(20, 19, D:1)
  a jackal skeleton
(24, 6, D:1)
  a +0 long sword
(25, 17, D:1)
  a +0 hand axe
(26, 17, D:1)
  a jackal corpse (skeletalised by now)
  a jackal corpse (skeletalised by now)
(31, -4, D:1)
  a +0 short sword
  2 stones
(32, -5, D:1)
  a hobgoblin corpse (skeletalised by now)
(32, 24, D:1)
  a +0 ring mail
(40, 21, D:1)
  a +0 dagger

Level 2 of the Dungeon
(0, 0, D:2)
  a potion of degeneration
(2, 1, D:2)
  a +0 dagger
  a kobold corpse
(3, 1, D:2)
  a bat corpse