IndexError

Level 1 of the Dungeon
(0, 0, D:1)
  a rat skeleton
(7, -9, D:1)
  a +0 dagger
  a ball python corpse (skeletalised by now)
(19, -6, D:1)
  a +0 club
(20, -6, D:1)
  a +0 robe
(26, 16, D:1)
  a +0 hand axe
  3 poisoned darts
  a goblin corpse (skeletalised by now)
(28, 13, D:1)
  a jackal skeleton
(31, 16, D:1)
  a hobgoblin skeleton
(32, 17, D:1)
  a jackal skeleton
(32, 19, D:1)
  a +0 club
(36, 22, D:1)
  a +0 dagger
(37, -10, D:1)
  a ball python skeleton
(37, -9, D:1)
  a ball python skeleton
(41, 3, D:1)
  a stone
  a +0 dagger
  a kobold skeleton
(41, 10, D:1)
  a +0 dagger
  a goblin skeleton
(42, 0, D:1)
  a ball python skeleton
(43, 12, D:1)
  a ball python skeleton

Level 2 of the Dungeon
(0, 0, D:2)
  a frilled lizard corpse (skeletalised by now)
(9, -19, D:2)
  an adder skeleton
(9, -18, D:2)
  a +0 whip
  a kobold skeleton
(9, 2, D:2)
  an adder skeleton
(9, 3, D:2)
  a hobgoblin skeleton
(14, 4, D:2)
  a +0 robe
(14, 23, D:2)
  a serpent talisman
(16, -22, D:2)
  a +0 spear
(17, -25, D:2)
  a quokka skeleton
(19, 11, D:2)
  a +0 trident
(21, -24, D:2)
  a +0 dagger
  4 stones
(22, 17, D:2)
  a rat skeleton
(23, -28, D:2)
  a bat skeleton
(23, -14, D:2)
  a +1 dagger of venom
  a -2 sling {Berta}
(24, -21, D:2)
  a +0 club
(36, 22, D:2)
  a +0 ring mail
(38, 22, D:2)
  a +0 club
(40, -15, D:2)
  7 stones
(41, -9, D:2)
  a frilled lizard skeleton
(42, -12, D:2)
  a jackal skeleton
  a jackal skeleton
(47, -11, D:2)
  a rat skeleton
(50, -13, D:2)
  a +0 whip
  a kobold skeleton

Level 3 of the Dungeon
(0, 0, D:3)
  a +0 short sword
(1, -2, D:3)
  12 gold pieces
(2, -36, D:3)
  a +0 ring mail
(2, -4, D:3)
  a +0 hand axe
  a +0 chain mail
  an orc corpse
(2, -1, D:3)
  a +0 flail
  a +0 leather armour
(3, -5, D:3)
  a +0 flail
  a +0 ring mail
(3, -4, D:3)
  a +0 flail
(14, -17, D:3)
  a +0 short sword
(15, -32, D:3)
  a +0 short sword
  a stone
  a kobold corpse
(15, -21, D:3)
  a ring of willpower