Raul Miller wrote:
left frame = 2        , right frame = empty

I'd make that ,2 for my left frame, but yeah.
Given that a frame is always a list, the , does seem redundant.

Like this?
  2 4 { 3 1 4 1 5 9
4 5
Simply typing in the statement, seeing the response and adjusting your theory of what is happening is a useful learning tool.
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