a-a a-b aaa aab aad aas aau aay ab- aba abb abd abs abu aby ad- ada adb add ads adu ady as- asa asb asd ass asu asy au- aua aub aud aus ay- aya ayd ays ayu b-u baa bab bad bas bau bay bba bbb bbd bbs bbu bby bda bdb bdd bds bdu bdy bsa bsb bsd bss bsu bsy bua bub bud bus buu buy by- bya byd bys byu daa dab dad das dau day dba dbb dbd dbs dbu dby dda ddb ddd dds ddu ddy dsa dsb dsd dss dsu dsy dua dub dud dus duy dy- dya dyb dyd dys dyu dyy saa sab sad sas sau say sba sbb sbd sbs sbu sby sda sdb sdd sds sdu sdy ss- ssa ssb ssd sss ssu sua sub sud sus suu suy sy- sya syb syd sys syu ua- uaa uab uad uas uau uay uba ubb ubs ubu uby uda udb udd uds udu usa usb usd uss usu uua uus uuu uys uyu yaa yab yad yas yau yay ybs yby yda yds ydy ysa ysb yss ysu ysy yua yud yus yuu yuy yyb yys yyu yyy