a-ya a-yo aaaa aaab aaac aaba aabb aabc aaby aaca aacb aacc aaco aacy aaoo abaa abab abac abay abb- abba abbb abbo abby abca abcb abcc aboa abob aboo aboy abyc abyy acaa acab acac acba acca accc acco accy acoa acoy aoba aoca ay-o ayao ayay ayca ayoo ayya baaa baba babb babo baby bac- baca bacc baco baya bayo bbay bbbb bboy bbyo bcaa bcbc bcca bccc boab boac boba bobb bobo boby boca boco boob booc boya boyo byoa byob byoc c-bo caaa caab caac caba cabo caby cac- caca cacc caco cayo cbac cbbc cbca cbcc ccaa ccab ccac ccba ccbc ccca cccb cccc ccob ccoc coba cobb cobo coby coca coco coob coya coyo cya- cyaa cyba cybb cybc cybo cyc- cyca cycb cycc cyoa cyy- cyyc obay obba obbo obby oboy ocab ocac ocbc occa occc ooaa ooba ooby oooo yaba yabo yacc yaco yacy yaya yayo ycab ycao yccc yoba yobo yoyo yyyy