QED

the Dungeon
(0, 0, D)
  a scroll of blinking
  a potion of berserk rage
  a potion of haste
(0, 3, D)
  a rat corpse
(0, 4, D)
  a hobgoblin corpse
  a giant cockroach corpse
(0, 9, D)
  a worker ant corpse
(0, 10, D)
  a giant cockroach corpse