W = {
     {{},
      {0,0,0,0,1,1,1,1},},

     {{},
      {0,0,0,1,0,0,0,0,1},},

     {{},
      {0,0,0,1,0,0,0,0,1},},


}
for z = 1,#W do
  for y = 1,#W[z] do
      for x = 1,#W[z][y] do
        slot = W[z][y][x]
        if slot ~= 0 then
          turtle.select(slot)
          turtle.placeDown()
        end
        turtle.forward()
      end
      for a = 1,#W[z][y] do
         turtle.back()
      end
      turtle.turnLeft()
      turtle.forward()
      turtle.turnRight()
  end
  turtle.turnRight()
  for A = 1,#W[z] do
    turtle.forward()
  end
  turtle.turnLeft()
  turtle.up()
end