IndexError

Level 1 of the Dungeon
(0, 0, D:1)
  a rat skeleton
(8, 10, D:1)
  a goblin corpse (skeletalised by now)
(13, -9, D:1)
  3 stones
  a kobold skeleton
(13, -8, D:1)
  a rat skeleton
(15, 41, D:1)
  a rat corpse (skeletalised by now)
(18, 5, D:1)
  a +0 ring mail
(19, -4, D:1)
  a stone
  a goblin skeleton
(19, 23, D:1)
  a +0 leather armour
(21, 9, D:1)
  a rat skeleton
(21, 11, D:1)
  a rat skeleton
(28, 1, D:1)
  a ball python skeleton
(51, -10, D:1)
  a ball python skeleton
(52, -9, D:1)
  7 stones

Level 2 of the Dungeon
(0, 0, D:2)
  a ball python skeleton
(0, 12, D:2)
  a +0 leather armour
(1, -1, D:2)
  3 stones
(4, 41, D:2)
  a rat skeleton
(8, 8, D:2)
  a +0 robe
(17, -4, D:2)
  6 stones
(21, 4, D:2)
  a goblin skeleton
(24, 3, D:2)
  3 stones
(24, 43, D:2)
  a kobold skeleton
(32, 49, D:2)
  8 stones
(50, -4, D:2)
  a goblin corpse (skeletalised by now)
(57, 51, D:2)
  a +0 dagger
  a +0 war axe
  a +0 whip
  a +0 whip
  a +0 dagger
  a +0 short sword
  a +0 club
  a +0 club
  a +0 dagger
  a +0 dagger
  a +0 dagger
  a +0 club
  a +0 short sword
  a +0 dagger

Level 3 of the Dungeon
(0, 0, D:3)
  an adder skeleton
(11, -28, D:3)
  a bat skeleton
(11, -27, D:3)
  an adder skeleton
(20, -25, D:3)
  5 stones
(24, -36, D:3)
  a goblin skeleton
(27, 5, D:3)
  a +0 ring mail
(32, -27, D:3)
  a ball python skeleton
(33, -26, D:3)
  5 poisoned darts
(40, -9, D:3)
  an orc skeleton
(43, -25, D:3)
  a kobold corpse (skeletalised by now)
(44, -36, D:3)
  a +0 helmet
(44, 1, D:3)
  a ball python skeleton
(45, -1, D:3)
  a +0 helmet
(60, -6, D:3)
  a book of Geomancy

Level 4 of the Dungeon
(0, 0, D:4)
  a +0 dagger
(0, 1, D:4)
  a scroll of vulnerability
(4, 0, D:4)
  a +0 short sword
  an orc corpse
(5, 0, D:4)
  a +0 dagger
  a +0 leather armour
  an orc corpse
(24, -21, D:4)
  6 poisoned darts