[R] Putting x into the right subset

John Wiedenhoeft wiedenhoeft at gmx.net
Sat Jul 22 21:37:21 CEST 2006

Ahh, got it:
> There must be an error in reasoning, but I can't figure out where it
> is...

Consider 3 pairs: (1, 2), (2, 3), (1, 3), first is put in the first
line, second in the second, and third in the first, resulting in the 3
being contained in both. Simply folding lines together solves it.

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