QED
(correction of the example)
(105: ) (106: A) (107: B ) (108: X ) (109: C,D) (110: E)
(105: ) (106: A) (107: X,B) (108: C,D) (109: E ) (110: )
moving down X will result in either
(105: A) (106: B) (107: X ) (108: C,D) (109: E ) (110: )
or equivalently
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