IndexError

Level 1 of the Dungeon
(0, 0, D:1)
  a +0 dagger
(2, -9, D:1)
  a +0 short sword
(2, -7, D:1)
  a hobgoblin skeleton
(6, -13, D:1)
  a +0 chain mail
(8, -35, D:1)
  a +0 leather armour
(15, -38, D:1)
  a ball python skeleton
(19, -25, D:1)
  3 stones
(21, -42, D:1)
  a ball python skeleton
(21, -11, D:1)
  6 stones
(24, 0, D:1)
  a hobgoblin corpse (skeletalised by now)
(26, -20, D:1)
  a +0 robe
(33, -22, D:1)
  a +0 ring mail
(33, -15, D:1)
  a bat corpse (skeletalised by now)
(34, -34, D:1)
  a bat skeleton
(38, -36, D:1)
  a rat skeleton
(43, -23, D:1)
  3 large rocks
(51, -9, D:1)
  a +0 leather armour

Level 2 of the Dungeon
(0, 0, D:2)
  a rat corpse
(12, -21, D:2)
  a +0 dagger
  a kobold skeleton
(13, -15, D:2)
  2 stones
(18, 8, D:2)
  a ball python skeleton
(24, -17, D:2)
  a +0 club
  a kobold skeleton
(24, -2, D:2)
  a +0 flail
(27, -13, D:2)
  a +0 leather armour
(28, 2, D:2)
  a +0 leather armour
(28, 4, D:2)
  a ball python skeleton
(29, 4, D:2)
  a +0 club
(32, -15, D:2)
  a +0 ring mail
(32, 2, D:2)
  a ball python skeleton
(33, -10, D:2)
  a jackal skeleton
(38, -27, D:2)
  a +0 club
  a goblin corpse (skeletalised by now)
(40, -29, D:2)
  a +0 spear
(42, -26, D:2)
  a hobgoblin corpse (skeletalised by now)
(44, -9, D:2)
  a +0 scale mail
(48, -2, D:2)
  a +0 chain mail
(51, -6, D:2)
  7 stones

Level 3 of the Dungeon
(0, 0, D:3)
  a +0 short sword
  a frilled lizard corpse
(1, 1, D:3)
  a +0 hand axe
  a +0 dagger
  a +0 robe