IndexError

Level 1 of the Dungeon
(0, 0, D:1)
  a +0 robe
(2, -16, D:1)
  a +0 mace
(4, -25, D:1)
  6 stones
(7, -2, D:1)
  a +0 club
  a goblin skeleton
(9, -25, D:1)
  a +0 ring mail
(26, -25, D:1)
  a +0 robe
(37, -39, D:1)
  a +0 dagger

Level 2 of the Dungeon
(0, 0, D:2)
  a +0 ring mail
(14, -31, D:2)
  a +0 short sword
(17, -30, D:2)
  a hobgoblin corpse
(20, -27, D:2)
  a bat corpse
(26, -33, D:2)
  a wand of iceblast (7)
(34, 3, D:2)
  a +0 chain mail