https://en.wikibooks.org/wiki/Chinese_%28Mandarin%29/Print_version#GNU_Free_Documentation_License
this License in order to use it for manuals for free software, because free software needs free documentation: a free program should come with manuals
https://en.wikibooks.org/wiki/Mirad_Grammar/print_version#NAS_money
tern-, trin- u(n)-....four-, quadr-, tetra-, tetarto-, tessar-, quatern- uo(n)-....quadrupl-, quart-, tetrad-, fourfold, foresome, tetraplo- uy(n)-..