IndexError

Level 1 of the Dungeon
(10, 25, D:1)
  a +0 robe
(16, -4, D:1)
  a hobgoblin corpse (skeletalised by now)
(16, 26, D:1)
  a +0 dagger
(19, 9, D:1)
  a +0 dagger
(20, 9, D:1)
  a rat corpse (skeletalised by now)
(20, 20, D:1)
  a +0 leather armour
(23, 1, D:1)
  a +0 short sword
(24, 38, D:1)
  a +0 dagger
(29, -2, D:1)
  a +0 dagger
(30, -1, D:1)
  a +0 club
(30, 5, D:1)
  a +0 sling
(30, 14, D:1)
  a +0 dagger
(32, -11, D:1)
  a hobgoblin corpse (skeletalised by now)
(32, 9, D:1)
  a +0 leather armour
(36, 8, D:1)
  a +0 leather armour
(37, 11, D:1)
  a hobgoblin skeleton
(39, 25, D:1)
  a bat skeleton
(44, 23, D:1)
  a +0 dagger
  a goblin skeleton
(46, 21, D:1)
  a hobgoblin skeleton
(50, 21, D:1)
  a rat corpse (skeletalised by now)
(50, 24, D:1)
  a +0 scale mail

Level 2 of the Dungeon
(2, 34, D:2)
  a +0 hand axe
(5, 9, D:2)
  a quokka skeleton
(11, 17, D:2)
  an inkwell talisman
(13, 22, D:2)
  a +0 whip
(14, 22, D:2)
  a quokka corpse (skeletalised by now)
(18, 37, D:2)
  a rat skeleton
(28, 16, D:2)
  a +0 dagger
(30, 49, D:2)
  a ball python skeleton
(36, 49, D:2)
  a ball python skeleton
(39, 9, D:2)
  a ball python corpse (skeletalised by now)
(41, 44, D:2)
  a +0 club
  a goblin corpse (skeletalised by now)
(42, 18, D:2)
  a +0 club
(51, 46, D:2)
  a jackal corpse (skeletalised by now)
(51, 47, D:2)
  a jackal corpse (skeletalised by now)
(60, 51, D:2)
  a +0 scale mail

Level 3 of the Dungeon
(0, 1, D:3)
  a +0 leather armour
(2, 1, D:3)
  a quokka corpse (skeletalised by now)
(4, -3, D:3)
  2 stones
  a kobold corpse (skeletalised by now)
(6, -7, D:3)
  a quill talisman
(8, -5, D:3)
  a +0 scale mail
(10, -3, D:3)
  an adder skeleton
(15, -1, D:3)
  a rat skeleton
(17, 8, D:3)
  a hobgoblin skeleton
(27, 6, D:3)
  a hobgoblin corpse

Level 4 of the Dungeon
(4, -49, D:4)
  a dart slug corpse
(5, -26, D:4)
  a +0 dagger
  2 boomerangs
  an orc corpse
(6, -26, D:4)
  a +0 dagger
  a +0 robe
  an orc corpse
(13, -44, D:4)
  a hobgoblin corpse