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'</code>' seems to be superfluous in $seq1 and $seq3 $seq1 = ($d1, $d2)</code> $seq3 = (3, 4, 5)</code>
This seems to have been fixed somewhere along the way. Thank you for your comment.
Yupp, it was fixed in: http://www.w3.org/Bugs/Public/show_bug.cgi?id=2410 Frans
Closing bug because commenter has not objected to the resolution posted and more than two weeks have passed.