IndexError

Level 1 of the Dungeon
(0, 0, D:1)
  a +0 leather armour
(5, -6, D:1)
  a quokka skeleton
(5, -5, D:1)
  a +0 dagger
  a goblin skeleton
(6, 7, D:1)
  a +0 dagger
(8, 8, D:1)
  a bat skeleton
(12, -1, D:1)
  a +0 dagger
(18, -12, D:1)
  a +0 scale mail
(18, 15, D:1)
  a +0 leather armour
(23, -1, D:1)
  a +0 whip
  a kobold corpse (skeletalised by now)
(36, -6, D:1)
  a +0 dagger
(38, -6, D:1)
  a hobgoblin corpse (skeletalised by now)
(39, 26, D:1)
  a +0 short sword
  a kobold corpse (skeletalised by now)
(43, 23, D:1)
  a rat skeleton
(45, -7, D:1)
  a +0 spear
(47, 13, D:1)
  a +0 robe
(53, 6, D:1)
  a hobgoblin skeleton
(54, 3, D:1)
  a bat skeleton
(54, 13, D:1)
  a frilled lizard corpse (skeletalised by now)

Level 2 of the Dungeon
(11, 4, D:2)
  a +0 club
  a goblin skeleton
(15, 15, D:2)
  a +0 club
(26, 8, D:2)
  a +0 hand axe
(39, 0, D:2)
  a +0 helmet
(41, 18, D:2)
  a +0 dagger
(46, -8, D:2)
  a +0 robe

Level 3 of the Dungeon
(0, 0, D:3)
  a +0 dagger
  a +0 ring mail
(0, 1, D:3)
  a +0 whip
  a +0 morningstar
(7, -3, D:3)
  an adder corpse
(17, 4, D:3)
  a bat corpse
(19, -8, D:3)
  a giant cockroach corpse
(19, 3, D:3)
  a ball python corpse
(20, 4, D:3)
  a +0 dagger
(36, -11, D:3)
  a hobgoblin corpse
(37, -7, D:3)
  a scroll of identify
(45, -19, D:3)
  a +0 short sword
(48, -20, D:3)
  a scroll of teleportation
(49, -26, D:3)
  a +0 buckler