a-ya a-yo aaaa aaab aaap aaba aabb aabp aaby aaoo aapa aapo abaa abab abap abay abb- abba abbb abbo abby aboa abob aboo aboy abpa abpp abyy aoba aopo apao apap apay apba apo- apoo apop appa appy ay-o ayao ayay ayoo ayya baaa baba babb babo baby bapa bapp baya bayo bbay bbbb bboy bbyo boab boba bobb bobo boby boob boop bopa bopp boya boyo bpay byoa byob byop obay obba obbo obby oboy ooaa ooba ooby oooo opap opo- oppa oppo oppy oypa paap paba papa papb papp papy pay- paya payb payp pbpa poba pobo poop pop- popa popo popp popy poya poyo ppap ppoa pppa pppo pppp pyao pyay pyo- pypy yaba yabo yapa yapp yaya yayo yoba yobo yoop yopo yopy yoyo ypoa yyyy