docs: async def one(s: Sublemon):
      """Spin up some subprocesses, sleep, and echo a message for this coro."""
      shell_cmds = [
          'sleep 1 && echo subprocess 1 in coroutine one',
          'sleep 1 && echo subprocess 2 in coroutine one']
      async for line in s.iter_lines(*shell_cmds):
          print(line)