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  • $\begingroup$ I am glad I was in right direction...I really like the clarity and imho elegance +1:) $\endgroup$ Commented Apr 11, 2015 at 6:34
  • $\begingroup$ @ubpdqn Thanks. Unfortunately I think I lost some clarity with the edit but I gained a large measure of performance. $\endgroup$ Commented Apr 11, 2015 at 6:46
  • $\begingroup$ @Mr.Wizard: Since I'm holding off re-installing 10.x until a non foo-bar release, how does the performance of this compare to the MapThread implementation of Pickett (which can be ~doubled with pre-10 functionality)? $\endgroup$ Commented Apr 11, 2015 at 6:51
  • $\begingroup$ @rasher I don't believe Pickett's answer is general; does it not rely on an incidental quality of the example data? $\endgroup$ Commented Apr 11, 2015 at 6:53
  • $\begingroup$ @Mr.Wizard: Not sure I follow - error aside (should be using Sequence to properly string mismatches vs Flatten), it seems to do what OP is after (the x1/X1... seems to imply positional comparisons). Am I missing something? Nonetheless, curious re: perf. comparison. Oh, and +1 for your usual elegance. $\endgroup$ Commented Apr 11, 2015 at 7:03