in frame 1/1:
undefined
in frame 1/2:
  value from frame 1/1
in child frame 1/1:
  value from frame 1/2
in child frame 1/2:
  value from child frame 1/1
in frame 1/3:
  value from child frame 1/2
in child frame 2/1:
undefined
in child frame 2/2:
  value from child frame 2/1
in frame 2/1:
  value from child frame 2/2
