Source was used for the general structure, but centos were revised according to existing centology. Ending: cf. http://www.omnigreg.at/wiki/doku.php?id=ant:0368 and http://www.omnigreg.at/wiki/doku.php?id=ant:0382 ; beginning: cf. http://www.omnigreg.at/wiki/doku.php?id=ant:0331