For a moment, every division into 2 has 5 parts: So if L/R split? leftright left | left-to-middle | middle | middle-to-right | right Then middle can go away, leaving: left | left-to- middle | | middle-to-right | right Then as the middle is gone, left | right or this | that

For a moment, every division into 2 has 5 parts: So if L/R split?
leftright
left | left-to-middle | middle | middle-to-right | right
Then middle can go away, leaving:
left | left-to- middle | | middle-to-right | right
Then as the middle is gone,
left | right
or
this | that

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