IndexError

Level 1 of the Dungeon
(0, 0, D:1)
  a +0 dagger
  a goblin corpse (skeletalised by now)
(0, 1, D:1)
  a bat corpse (skeletalised by now)
(1, 19, D:1)
  a +0 club
(4, 10, D:1)
  a ball python corpse (skeletalised by now)
(6, 22, D:1)
  a jackal corpse (skeletalised by now)
(7, 27, D:1)
  a +0 dagger
(7, 31, D:1)
  a bat skeleton
(13, 36, D:1)
  a +0 short sword
  2 stones
  a kobold corpse (skeletalised by now)
(20, 36, D:1)
  a +0 club
(22, 33, D:1)
  a +0 club
  a goblin skeleton
(23, 35, D:1)
  a +0 chain mail
(24, 30, D:1)
  2 boomerangs
(26, -1, D:1)
  a +0 robe
(34, 5, D:1)
  a +0 dagger
(36, 31, D:1)
  a hobgoblin skeleton
(37, 33, D:1)
  a frilled lizard corpse (skeletalised by now)
(37, 34, D:1)
  a frilled lizard corpse (skeletalised by now)
(39, -6, D:1)
  a +0 club
(41, 33, D:1)
  a +0 dagger
  a goblin corpse (skeletalised by now)
(45, 27, D:1)
  a bat corpse (skeletalised by now)

Level 2 of the Dungeon
(0, 0, D:2)
  a +0 leather armour
(13, 2, D:2)
  a ball python skeleton
(23, 39, D:2)
  7 stones
(24, 7, D:2)
  a +0 short sword
  a +0 scale mail
(25, 18, D:2)
  a +0 rapier
(26, 7, D:2)
  a jackal skeleton
(30, 4, D:2)
  a jackal skeleton
(45, 21, D:2)
  a +0 club
  a goblin skeleton
(47, 14, D:2)
  a +0 robe
(49, 24, D:2)
  a +0 dagger
(55, 16, D:2)
  a +0 leather armour
(60, 16, D:2)
  a +0 club
  a goblin skeleton
(62, 13, D:2)
  a +0 mace

Level 3 of the Dungeon
(0, 0, D:3)
  an adder corpse
(9, 5, D:3)
  a potion of heal wounds
(10, 8, D:3)
  a quokka corpse
(15, 2, D:3)
  a +0 ring mail