local function placeRails()
  local hasRails = inventory.getStackInInternalSlot(4)
              robot.select(4)
           if robot.count() <=2 then
              robot.select(8)
              robot.turnRight()
              robot.place()
              robot.select(2)
              robot.drop()
              robot.select(3)
              robot.drop()
              robot.select(5)
              robot.drop()
              robot.select(6)
              robot.drop()
              robot.select(7)
              robot.drop()
              robot.select(9)
              robot.drop()
              robot.select(10)
              robot.drop()
              robot.select(11)
              robot.drop()
    for slot = 1, inventory.getInventorySize(3) do
           if hasRails = inventory.getStackInSlot(slot) then
              repeat
              inventory.suckFromSlot(3, slot)
              until robot.count(4) >= 3
          return slot
              robot.swing()
              robot.select(2)
              robot.transferTo(8)
              robot.select(4)
              robot.turnLeft()
            end
          end
        end
              robot.turnAround()
              robot.place()
              robot.turnAround()
end