IndexError

Level 6 of the Dungeon
(0, 0, D:6)
  6 stones
(5, 1, D:6)
  a +0 dagger
(11, 23, D:6)
  a potion of invisibility
(17, 18, D:6)
  8 stones
(21, 18, D:6)
  a +0 robe
(21, 21, D:6)
  a +0 leather armour

Level 7 of the Dungeon
(0, 0, D:7)
  a +0 robe