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sequences at the current position.
This callback will be called with one, two, or three arguments.

If one argument, then only the element at the given position from the 
first sequence is not in either of the other two sequences.

If two arguments, then there is no element in the first sequence that 
corresponds to the elements at the given positions in the second and 
third sequences.

If three arguments, then the element at the given position in the first 
sequence is different than the corresponding element in the other two 
sequences, but the other two sequences have corresponding elements.

=item B_DIFF

This is called if the second sequence is different than the other two 
sequences at the current position.
This callback will be called with one, two, or three arguments.   

If one argument, then only the element at the given position from the 
second sequence is not in either of the other two sequences.

If two arguments, then there is no element in the second sequence that 
corresponds to the elements at the given positions in the first and 
third sequences.

If three arguments, then the element at the given position in the second 
sequence is different than the corresponding element in the other two 
sequences, but the other two sequences have corresponding elements.

=item C_DIFF

This is called if the third sequence is different than the other two 
sequences at the current position.
This callback will be called with one, two, or three arguments.   

If one argument, then only the element at the given position from the 
third sequence is not in either of the other two sequences.

If two arguments, then there is no element in the third sequence that 
corresponds to the elements at the given positions in the first and 
second sequences.

If three arguments, then the element at the given position in the third 
sequence is different than the corresponding element in the other two 
sequences, but the other two sequences have corresponding elements.

=item CONFLICT

This is called if all three sequences have different elements at the 
current position.  The three arguments are the current positions within 
each sequence.

=back 4

=head1 BUGS

Most assuredly there are bugs.  If a pattern similar to the above 
example does not work, send it to <jsmith@cpan.org> or report it on 
<http://rt.cpan.org/>, the CPAN bug tracker.

L<Algorithm::Diff|Algorithm::Diff>'s implementation of 
C<traverse_sequences> may not be symmetric with respect to the input 
sequences if the second and third sequence are of different lengths.  
Because of this, C<traverse_sequences3> will calculate the diffs of 
the second and third sequences as passed and swapped.  If the differences 
are not the same, it will issue an `Algorithm::Diff::diff is not symmetric 
for second and third sequences...' warning.  It will try to handle 
this, but there may be some cases where it can't.

=head1 SEE ALSO

L<Algorithm::Diff>.

=head1 AUTHOR

James G. Smith, <jsmith@cpan.org>

=head1 COPYRIGHT

Copyright (C) 2003, 2007  Texas A&M University.  All Rights Reserved.

This module is free software; you may redistribute it and/or
modify it under the same terms as Perl itself.