return
{
  entities =
  {
    {"copper-pipe", {x = -0.5, y = -2}, {}},
    {"copper-pipe", {x = 0.5, y = -3}, {dmg = {dmg = 24}, }},
    {"copper-pipe", {x = 0.5, y = -2}, {}},
    {"bob-small-inline-storage-tank", {x = 0.5, y = -1}, {dmg = {dmg = 49}, }},
    {"copper-pipe", {x = 0.5, y = 0}, {}},
    {"oil-steam-boiler", {x = 0.5, y = 2}, {dir = "south", dmg = {dmg = 137}, }},
  },
}