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'''This is a work in progress, especially with regards to formatting...''' | '''This is a work in progress, especially with regards to formatting...''' | ||
''The following article is work of Jerry Hanna and comes from his website, [http://www.perardua.net/pipes/GBDshape.html Peradua.net]. Many thanks to Jerry for all the work, and for permission to adapt it for Pipeia'' | ''The following article is the work of Jerry Hanna and comes from his website, [http://www.perardua.net/pipes/GBDshape.html Peradua.net]. Many thanks to Jerry for all the work, and for permission to adapt it for Pipeia'' | ||
=== Introduction === | === Introduction === |