a-a a-b aaa aab aar aas aau aay ab- aba abb abr abs abu aby ar- ara arb arr ars aru ary as- asa asb asr ass asu asy au- aua aub aur aus ay- aya ayr ays ayu b-u baa bab bar bas bau bay bba bbb bbr bbs bbu bby bra brb brr brs bru bry bsa bsb bsr bss bsu bsy bua bub bur bus buu buy by- bya byr bys byu ra- raa rab rar ras rau ray rba rbb rbr rbs rbu rra rrb rrr rrs rru rsa rsb rsr rss rsu rua rub rur rus ruu ruy ry- rya ryr rys ryu ryy saa sab sar sas sau say sba sbb sbr sbs sbu sby sr- sra srb srr srs sry ss- ssa ssb ssr sss ssu sua sub sur sus suu suy sy- sya syb syr sys syu ua- uaa uab uar uas uau uay uba ubb ubr ubs ubu uby ur- ura urb urr urs uru ury usa usb usr uss usu uua uur uus uuu uys uyu yaa yab yar yas yau yay ybr ybs yby yra yrs yru ysa ysb ysr yss ysu ysy yua yur yus yuu yuy yyb yys yyu yyy