IndexError

Level 1 of the Dungeon
(1, -1, D:1)
  a bat corpse (skeletalised by now)
(2, -13, D:1)
  a +0 short sword
(18, 12, D:1)
  a +0 club
  2 stones
(22, -26, D:1)
  a quokka corpse (skeletalised by now)
(22, -20, D:1)
  a ball python corpse (skeletalised by now)
(37, 18, D:1)
  6 stones
(40, -18, D:1)
  a goblin corpse (skeletalised by now)
(43, -1, D:1)
  a bat skeleton
(47, -15, D:1)
  a quokka corpse (skeletalised by now)

Level 2 of the Dungeon
(0, 0, D:2)
  4 boomerangs
(5, -16, D:2)
  a +0 chain mail
(9, -5, D:2)
  2 atropa-tipped darts
(12, -22, D:2)
  a rat skeleton
(12, -5, D:2)
  a +0 robe
  a +0 scythe
  the human corpse of Sigmund (skeletalised by now)
(17, 5, D:2)
  a +0 club
(19, 7, D:2)
  a frilled lizard corpse (skeletalised by now)
(25, -25, D:2)
  a +0 dagger
(29, 23, D:2)
  a bat corpse (skeletalised by now)
(32, -1, D:2)
  a +0 club
(33, 0, D:2)
  8 stones
(35, -13, D:2)
  a +0 chain mail
(35, 2, D:2)
  a +0 short sword
  5 stones
  a hobgoblin corpse (skeletalised by now)
  a kobold corpse (skeletalised by now)
(39, -11, D:2)
  a +0 club
(40, -22, D:2)
  a +0 dagger
(42, -21, D:2)
  a +0 dagger
  a +0 sling
(42, -17, D:2)
  a +0 sling

Level 3 of the Dungeon
(4, 27, D:3)
  a jackal corpse (skeletalised by now)
(10, -1, D:3)
  a +0 leather armour
(11, -6, D:3)
  a +0 robe
(24, 26, D:3)
  a +0 dagger
(26, -19, D:3)
  a +0 ring mail
(26, -15, D:3)
  a hobgoblin corpse (skeletalised by now)
(27, -1, D:3)
  2 stones
(40, 14, D:3)
  a +0 dagger
  a +0 sling
  a goblin skeleton
(41, 14, D:3)
  a +0 whip
  a +0 leather armour
(42, 12, D:3)
  a +0 dagger of venom
(43, 12, D:3)
  a jackal skeleton
(45, 12, D:3)
  a jackal skeleton
(46, 8, D:3)
  a jackal skeleton
(54, -5, D:3)
  a +0 short sword

Level 4 of the Dungeon
(17, 11, D:4)
  4 stones
(20, 1, D:4)
  a +0 mace
(20, 21, D:4)
  a +0 hand axe
(21, -2, D:4)
  a +0 whip
  a gnoll corpse (skeletalised by now)
(21, 3, D:4)
  a hound corpse (skeletalised by now)
(23, -3, D:4)
  a +0 halberd
  a gnoll corpse (skeletalised by now)
(25, -4, D:4)
  a +0 flail
(28, -7, D:4)
  a rimehorn talisman
(39, 13, D:4)
  13 gold pieces