IndexError

Level 1 of the Dungeon
(0, 0, D:1)
  a +0 scale mail
(22, -9, D:1)
  a +0 whip
(25, -30, D:1)
  a +0 whip
(26, -29, D:1)
  a +0 leather armour
(28, -29, D:1)
  a +0 robe
(30, -27, D:1)
  a +0 whip
(35, -14, D:1)
  a +0 club
(36, -22, D:1)
  4 poisoned darts
(39, -15, D:1)
  a +0 dagger
(40, -33, D:1)
  a +0 club

Level 2 of the Dungeon
(6, -10, D:2)
  a +0 dagger
  a stone
  a +0 scale mail
(12, 2, D:2)
  a +0 ring mail
(18, -18, D:2)
  a +0 club
(20, -5, D:2)
  4 boomerangs
(25, -22, D:2)
  6 stones
(26, -19, D:2)
  3 stones
(37, -23, D:2)
  a +0 leather armour
(41, -23, D:2)
  a +0 whip
  2 stones
(43, -38, D:2)
  a +0 dagger
  a +0 ring mail
(45, -15, D:2)
  a +0 dagger
(50, -3, D:2)
  a +0 club
(60, -10, D:2)
  a +0 dagger

Level 3 of the Dungeon
[Shop] Zin's Purification Station
  a potion of curing (90 gold)
(3, -4, D:3)
  a +0 ring mail
(7, -27, D:3)
  a +0 trident
(11, -27, D:3)
  an amulet of reflection
  a ring of magical power {MP+9}
(13, -27, D:3)
  2 stones
(16, 1, D:3)
  an adder corpse (skeletalised by now)
(21, 4, D:3)
  a scroll of amnesia
(22, 4, D:3)
  a +0 club
(27, -22, D:3)
  a +0 leather armour
  a +0 short sword
(28, -22, D:3)
  a +0 club
  a +0 war axe
(28, 21, D:3)
  4 poisoned darts
(29, -17, D:3)
  a +0 short sword
  5 stones
(29, -10, D:3)
  a +0 dagger
(38, 5, D:3)
  a scarf of harm
(40, -16, D:3)
  a +0 whip
(40, -15, D:3)
  a +0 mace
  a +0 club
(41, -15, D:3)
  a +0 ring mail
  a +0 war axe
(52, -29, D:3)
  a +0 short sword

Level 4 of the Dungeon
(0, 0, D:4)
  a +0 spear
(2, -4, D:4)
  a +0 club
  a kobold corpse (skeletalised by now)
(2, 8, D:4)
  a +0 dagger
(7, 4, D:4)
  a dart slug corpse
(9, -6, D:4)
  a +0 dagger
  6 stones
  a kobold corpse
(10, 8, D:4)
  a jackal corpse
(11, -2, D:4)
  3 stones
(11, 5, D:4)
  a +0 dagger
  a goblin corpse
(16, 18, D:4)
  a +0 whip
(16, 19, D:4)
  a potion of brilliance
  a hobgoblin corpse
(17, 17, D:4)
  a +0 dagger
  a +0 robe
(20, -1, D:4)
  a +0 short sword