IndexError

Level 1 of the Dungeon
(0, 0, D:1)
  4 stones
(3, -11, D:1)
  a rat corpse (skeletalised by now)
(6, 1, D:1)
  a jackal corpse (skeletalised by now)
(6, 2, D:1)
  a jackal corpse (skeletalised by now)
(8, 2, D:1)
  a +0 short sword
  5 stones
  a kobold corpse (skeletalised by now)
(8, 19, D:1)
  a +0 dagger
(13, -5, D:1)
  a bat skeleton
(13, 14, D:1)
  a +0 robe
(15, -7, D:1)
  a rat skeleton
(19, -9, D:1)
  a +0 dagger
(21, 32, D:1)
  7 stones
(22, 0, D:1)
  a hobgoblin skeleton
(24, -13, D:1)
  a +0 sling
(31, -17, D:1)
  a +0 club
  a jackal skeleton
  a jackal skeleton
(34, -17, D:1)
  a jackal skeleton
(34, 23, D:1)
  a rat skeleton
(37, 33, D:1)
  a +0 short sword
(41, -12, D:1)
  a +0 robe
(44, 1, D:1)
  a +0 falchion
(44, 10, D:1)
  2 stones
(46, 3, D:1)
  a +0 mace
(47, 22, D:1)
  a hobgoblin skeleton
(49, 35, D:1)
  a ball python corpse (skeletalised by now)
(54, 11, D:1)
  7 stones
(54, 16, D:1)
  a +0 pair of boots
(60, 16, D:1)
  a rat corpse (skeletalised by now)
(62, 11, D:1)
  a +0 spear

Level 2 of the Dungeon
(0, 0, D:2)
  a +0 club
(1, 7, D:2)
  a +0 club
(5, -6, D:2)
  a frilled lizard skeleton
(5, 9, D:2)
  a +0 dagger
(6, -20, D:2)
  a jackal corpse (skeletalised by now)
(8, -20, D:2)
  a jackal corpse (skeletalised by now)
(11, 2, D:2)
  a +0 chain mail
(11, 3, D:2)
  7 stones
(12, -4, D:2)
  5 stones
(14, 0, D:2)
  a +0 leather armour
(15, -22, D:2)
  a quokka corpse (skeletalised by now)
(15, -4, D:2)
  9 stones
(19, 9, D:2)
  a bat skeleton
(20, 11, D:2)
  a +0 leather armour
(26, -14, D:2)
  a bat skeleton
(27, -14, D:2)
  5 stones
(29, 18, D:2)
  a +0 dagger
(31, 11, D:2)
  a +0 club
(32, 3, D:2)
  a +0 helmet
(37, -15, D:2)
  a hobgoblin skeleton
(38, 26, D:2)
  a +0 ring mail
(39, 8, D:2)
  a +0 club
(45, 23, D:2)
  5 stones

Level 3 of the Dungeon
(0, 0, D:3)
  a potion of heal wounds
(5, 2, D:3)
  4 stones
(29, 27, D:3)
  a +0 club
  a +0 sling
(37, 24, D:3)
  a +0 dagger
(46, 4, D:3)
  a ball python corpse
(50, 15, D:3)
  a +0 dagger