QED

2009/3/17 Daniel Schüssler <anotheraddress@gmx.de>
(correction of the example)

(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

(105:  ) (106: A) (107: B  ) (108: X  ) (109: C,D) (110: E)
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--
We can't solve problems by using the same kind of thinking we used when we created them.
   - A. Einstein