Efficiency

Level 2 of the Dungeon
(0, 0, D:2)
  8 gold pieces
(4, 1, D:2)
  10 gold pieces
(5, -2, D:2)
  a +0 club

Level 3 of the Dungeon
(0, 0, D:3)
  a giant cockroach corpse
(4, -1, D:3)
  13 arrows

Level 4 of the Dungeon
(0, 0, D:4)
  16 bolts

a sewer
(0, 0, Sewer)
  a stone
(0, 4, Sewer)
  2 stones
(0, 5, Sewer)
  a stone
(0, 6, Sewer)
  a rat corpse
(3, 0, Sewer)
  2 stones