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  • $\begingroup$ Remember to use lowercase for your defined symbols $\endgroup$ Commented Jan 24, 2013 at 2:20
  • 3
    $\begingroup$ Unless you strongly believe it's a bug, the result isn't nonsensical, but just unexpected to you. It would be helpful to know what you are expecting $\endgroup$ Commented Jan 24, 2013 at 2:21
  • $\begingroup$ In any case, if it is the pattern expansion what doesn't seem right to you, you'll probably fix it with proper parentheses? $\endgroup$ Commented Jan 24, 2013 at 2:26