IndexError

Level 1 of the Dungeon
(0, 0, D:1)
  a stone
(2, -13, D:1)
  a rat corpse (skeletalised by now)
(4, -22, D:1)
  a frilled lizard skeleton
(6, -22, D:1)
  a +0 short sword
  2 stones
  a kobold skeleton
(11, 5, D:1)
  an amulet of regeneration {+regen, !d}
(14, 8, D:1)
  a +0 spear
(21, -17, D:1)
  5 curare-tipped darts
(52, -4, D:1)
  a +0 dagger
  a goblin skeleton
(52, 6, D:1)
  a jackal skeleton
(52, 7, D:1)
  a jackal skeleton
(52, 10, D:1)
  a +0 plate armour
(59, -2, D:1)
  a +0 leather armour

Level 2 of the Dungeon
(0, 0, D:2)
  a +0 sling
(1, -19, D:2)
  a +0 dagger
(4, -3, D:2)
  a +0 short sword
(10, -14, D:2)
  a hobgoblin corpse
(11, -2, D:2)
  a +0 ring mail
(12, -13, D:2)
  a hobgoblin corpse
(12, 7, D:2)
  a +0 scimitar
(13, -16, D:2)
  a hobgoblin corpse
  a dart slug corpse
(14, -1, D:2)
  a +0 short sword
  2 stones
(19, 11, D:2)
  a +0 short sword
  3 stones
(22, 6, D:2)
  a rat corpse (skeletalised by now)
(23, 12, D:2)
  a +0 whip
(27, -17, D:2)
  a +0 club
  5 stones
  a kobold skeleton
(29, 1, D:2)
  a +6 ring of dexterity
(40, 5, D:2)
  a flux talisman
(44, -17, D:2)
  a rat corpse (skeletalised by now)
(46, 15, D:2)
  a +0 whip
(49, 3, D:2)
  an adder skeleton

Level 3 of the Dungeon
(0, 0, D:3)
  a +0 short sword
(2, -8, D:3)
  a +0 sling
  a +0 club
(2, -7, D:3)
  a potion of curing
(33, 21, D:3)
  a +0 robe