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If you have input that results in a crash or an erroneous output, then that is a bug. There is a list of current bugs on our Google bug tracker,
http://code.google.com/p/lilypond/issues/list
If you have discovered a bug which is not listed, please report the bug by following the directions on
http://lilypond.org/web/devel/participating/bugs
Please construct and submit minimal examples of bugs in reports. We do not have the resources to investigate reports which are not as small as possible.