IndexError

Level 1 of the Dungeon
(15, 52, D:1)
  a +0 robe
(16, 19, D:1)
  a +0 dagger
  a stone
(29, 15, D:1)
  a hobgoblin skeleton
(37, 47, D:1)
  a +0 short sword
(43, 12, D:1)
  a frilled lizard skeleton
(49, 50, D:1)
  a +0 short sword
(50, 17, D:1)
  a +0 dagger
(51, 41, D:1)
  a +0 dagger
  a kobold corpse (skeletalised by now)
(52, 41, D:1)
  a rat corpse (skeletalised by now)
(53, 40, D:1)
  a +0 dagger
  a kobold corpse (skeletalised by now)
(55, 12, D:1)
  a rat corpse (skeletalised by now)
(55, 38, D:1)
  a +0 dagger
  a goblin corpse (skeletalised by now)
(57, 23, D:1)
  a bat corpse (skeletalised by now)
(60, 12, D:1)
  a +0 dagger
  a goblin corpse (skeletalised by now)
(61, 58, D:1)
  a +0 club
  a kobold corpse (skeletalised by now)
(65, 25, D:1)
  a +0 whip
(68, 44, D:1)
  a +0 ring mail

Level 2 of the Dungeon
(1, 11, D:2)
  a rat skeleton
(11, 20, D:2)
  a +0 dagger
  a goblin skeleton
(27, 26, D:2)
  a +0 club
  a goblin skeleton
(30, 5, D:2)
  a rat skeleton
(39, 10, D:2)
  a +1 dagger of freezing
(45, 22, D:2)
  a +0 short sword
  a stone
  a kobold corpse (skeletalised by now)
(46, 22, D:2)
  a +0 club
  a +0 robe
(48, 21, D:2)
  a quokka corpse (skeletalised by now)
(49, 32, D:2)
  a hobgoblin corpse (skeletalised by now)

Level 3 of the Dungeon
(0, 0, D:3)
  a hobgoblin corpse (skeletalised by now)
(0, 2, D:3)
  a +0 trident
(1, 1, D:3)
  a rat corpse (skeletalised by now)
(1, 2, D:3)
  a +0 hand axe
  a +0 leather armour
  an orc corpse (skeletalised by now)
(1, 3, D:3)
  a +0 hand axe
  an orc corpse (skeletalised by now)
(2, -15, D:3)
  a rat skeleton
(3, -18, D:3)
  a +0 robe
  a +0 scythe
(7, -1, D:3)
  a quill talisman
(8, 6, D:3)
  a +0 chain mail
(9, 10, D:3)
  2 darts of disjunction
(16, -15, D:3)
  a +0 leather armour
(19, -13, D:3)
  a frilled lizard skeleton
(26, -15, D:3)
  a +0 dagger
(30, -29, D:3)
  an adder skeleton
(32, -32, D:3)
  an inkwell talisman
(44, -30, D:3)
  a bat skeleton
(44, -16, D:3)
  a bat skeleton
(53, -14, D:3)
  a +0 hammer