IndexError

Level 1 of the Dungeon
(0, 0, D:1)
  a +0 leather armour
(1, 25, D:1)
  a rat corpse (skeletalised by now)
(6, 23, D:1)
  a hobgoblin corpse (skeletalised by now)
(14, -2, D:1)
  a +0 sling
(20, 42, D:1)
  8 stones
(23, 23, D:1)
  a +0 ring mail
(25, 35, D:1)
  a goblin skeleton
(26, 11, D:1)
  a +0 short sword
(27, 26, D:1)
  a +0 chain mail
(29, 38, D:1)
  a +0 robe
(34, 37, D:1)
  a +0 dagger
(35, 12, D:1)
  a rat corpse (skeletalised by now)
(36, -5, D:1)
  a +0 club
(44, 27, D:1)
  a kobold corpse (skeletalised by now)
(50, -10, D:1)
  a +0 dagger
  a goblin corpse (skeletalised by now)

Level 2 of the Dungeon
(0, 0, D:2)
  a bat corpse (skeletalised by now)
(0, 1, D:2)
  a hobgoblin corpse (skeletalised by now)
(5, -5, D:2)
  4 large rocks {!d}
(5, -1, D:2)
  a +0 sling
(6, -16, D:2)
  an adder corpse (skeletalised by now)
(12, 2, D:2)
  a +0 club
  a kobold skeleton
(17, -1, D:2)
  an adder skeleton
(17, 1, D:2)
  a jackal skeleton
(20, 4, D:2)
  a jackal skeleton
(29, -24, D:2)
  a hobgoblin corpse (skeletalised by now)
(29, -22, D:2)
  a +0 mace
(30, 13, D:2)
  a +0 scale mail
(48, -14, D:2)
  a +0 leather armour

Level 3 of the Dungeon
(5, 6, D:3)
  an adder corpse (skeletalised by now)
(13, 18, D:3)
  a rat corpse (skeletalised by now)
(14, 16, D:3)
  a +0 dagger
(20, 40, D:3)
  a +0 leather armour
(32, 2, D:3)
  a rat skeleton
(32, 6, D:3)
  a +0 broad axe
(32, 42, D:3)
  a +0 plate armour
(35, 27, D:3)
  an adder skeleton
  a hobgoblin skeleton
(36, -1, D:3)
  a +0 leather armour
(43, 50, D:3)
  a +0 chain mail
(54, 50, D:3)
  a +0 short sword
  a kobold corpse (skeletalised by now)

Level 4 of the Dungeon
(0, 0, D:4)
  3 stones
(4, -27, D:4)
  a +1 dagger of venom (still there?)
  a +0 robe (still there?)
  a wand of flame (11) (still there?)
  the elf corpse of Dowan (still there?)
(5, 0, D:4)
  a +0 vampiric whip {!w}
(6, -27, D:4)
  a potion of enlightenment
(6, -1, D:4)
  a +0 club
  a +0 ring mail
  a +0 mace
  an orc corpse