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=over 4

=item B<--contrary> | B<-c> | B<--nocontrary>

Whether to compute the output line in contrary motion or not (default
is not to).

=item B<--duration>=I<value>

Set the default duration for rhythm handling (C<4> by default). Rhythm
handling should be transparent, though does not extend to tied notes,
triplet groups, or grace notes.

=item B<--flats> B<--noflats>

Print notes with flats instead of sharps.

=item B<--help>

Emits help and exits the program.