IndexError

Level 1 of the Dungeon
(0, 0, D:1)
  a scroll of acquirement
(0, 3, D:1)
  a rat corpse
(5, -2, D:1)
  a +0 dagger
  5 stones
(7, -1, D:1)
  a rat corpse
(16, -2, D:1)
  a stone