IndexError

Level 1 of the Dungeon
(0, 0, D:1)
  a +0 chain mail
(1, 7, D:1)
  7 stones
(13, 22, D:1)
  a +0 mace
(22, 50, D:1)
  a +0 dagger
(24, -1, D:1)
  a hobgoblin corpse (skeletalised by now)
(36, 18, D:1)
  6 stones
(36, 36, D:1)
  a +0 short sword
(46, 7, D:1)
  6 boomerangs
(54, 27, D:1)
  a +0 club
(56, 11, D:1)
  a +0 club

Level 2 of the Dungeon
(0, 0, D:2)
  3 stones

Level 3 of the Dungeon
(0, 0, D:3)
  a +0 short sword
  a stone
  a kobold corpse
(3, -1, D:3)
  a +0 short sword
(3, 1, D:3)
  a +0 short sword
(5, -1, D:3)
  a +0 mace
  a +0 chain mail
(13, -1, D:3)
  an amulet of magic regeneration
(14, -1, D:3)
  a potion of might