while(true) do
  id, message = rednet.receive(1024)
  if(message == "mine") then
    turtle.place()
    rs.setBundledOutput("back", 2 ^ (os.setComputerID() - 5))
  end
  while(rs.getBundledInput("back") != (2 ^ 16 - 1)) do
    sleep(10)
  end
  rs.setBundledOutput("back", 0)
  turtle.dig()
end