   STARTUP │ (Re)initialized boot script
  DIRECTOR │ Launched worker 0
     PHASE │ run
     START │ ./plan.py
   SUCCESS │ ./plan.py
     START │ paste -d ' ' head_x.txt tail_x.txt > paste_x.txt
   SUCCESS │ paste -d ' ' head_x.txt tail_x.txt > paste_x.txt
  DIRECTOR │ Trying to delete 0 outdated output(s).
     PHASE │ watch
   UPDATED │ tail_y.txt
   UPDATED │ head_z.txt
     PHASE │ run
     START │ ./plan.py
   SUCCESS │ ./plan.py
     START │ paste -d ' ' head_y.txt tail_y.txt > paste_y.txt
   SUCCESS │ paste -d ' ' head_y.txt tail_y.txt > paste_y.txt
  DIRECTOR │ Trying to delete 0 outdated output(s).
     PHASE │ watch
   DELETED │ tail_y.txt
     PHASE │ run
     START │ ./plan.py
   SUCCESS │ ./plan.py
  DIRECTOR │ Trying to delete 1 outdated output(s).
     CLEAN │ paste_y.txt
     PHASE │ watch
  DIRECTOR │ Stopping workers.
  DIRECTOR │ See you!
