a-a a-b aaa aab aad aar aau aav aay ab- aba abb abd abr abu abv aby ad- ada adb add adr adu adv ady ar- ara arb ard arr aru arv ary au- aua aub aud aur auv av- ava avb avd avr avu avy ay- aya ayd ayr ayu b-u baa bab bad bar bau bav bay bba bbb bbd bbr bbu bby bda bdb bdd bdr bdu bdv bdy bra brb brd brr bru brv bry bua bub bud bur buu buy bva bvb bvd bvr bvu bvv by- bya byd byr byu daa dab dad dar dau dav day dba dbb dbd dbr dbu dbv dby dda ddb ddd ddr ddu ddy dra drb drd drr dru drv dry dua dub dud dur duv duy dva dvb dvd dvr dvu dy- dya dyb dyd dyr dyu dyy ra- raa rab rad rar rau rav ray rba rbb rbd rbr rbu rda rdb rdd rdr rdu rdv rdy rra rrb rrd rrr rru rua rub rud rur ruu ruv ruy rva rvb rvd rvr rvu rvv rvy ry- rya ryd ryr ryu ryy ua- uaa uab uad uar uau uav uay uba ubb ubr ubu ubv uby uda udb udd udr udu udv ur- ura urb urd urr uru ury uua uur uuu uva uvb uvu uvv uyu v-a vaa vab vad var vau vav vay vba vbd vbr vbv vdb vdd vdr vdu vdv vra vrb vrd vrr vru vry vur vuv vva vvb vvr vvv vyd yaa yab yad yar yau yav yay ybr yby yda ydy yra yru yua yud yur yuu yuv yuy yva yvr yvy yyb yyu yyy