Efficiency

Level 1 of the Dungeon
(0, 0, D:1)
  11 stones
(6, -6, D:1)
  11 gold pieces
(6, -3, D:1)
  a +0 ring mail

Level 2 of the Dungeon
(0, 0, D:2)
  14 arrows
(5, -30, D:2)
  a +0 falchion
(10, -34, D:2)
  a +0 club
  a goblin corpse (skeletalised by now)
(10, -7, D:2)
  a cursed -3 club
  a hobgoblin corpse (skeletalised by now)
(29, -32, D:2)
  a stone
(34, -32, D:2)
  a kobold corpse (skeletalised by now)
(35, -27, D:2)
  a +0 whip

Level 3 of the Dungeon
(7, -20, D:3)
  a giant cockroach corpse
(11, -16, D:3)
  a +0 ring mail
(12, -8, D:3)
  29 stones
(17, -10, D:3)
  a +0 club (still there?)
  a +0 ring mail (still there?)
  an orc corpse (still there?)

Level 4 of the Dungeon
(0, 0, D:4)
  an adder corpse
(1, -11, D:4)
  9 gold pieces
(1, -8, D:4)
  a +0 scale mail
(2, 0, D:4)
  a worker ant corpse
(9, 2, D:4)
  a +0 short sword (still there?)
  a +0 ring mail (still there?)