a-a a-b aaa aab aad aao aar aau aav aay ab- aba abb abd abo abr abu abv aby ad- ada adb add ado adr adu adv ady aoa aob aod aoo aor aou aov ar- ara arb ard aro arr aru arv ary au- aua aub aud auo aur auv av- ava avb avd avo avr avu avy ay- aya ayd ayo ayr ayu b-u baa bab bad bao bar bau bav bay bba bbb bbd bbo bbr bbu bby bda bdb bdd bdo bdr bdu bdv bdy boa bob bod boo bor bou bov boy bra brb brd bro brr bru brv bry bua bub bud buo bur buu buy bva bvb bvd bvo bvr bvu bvv by- bya byd byo byr byu daa dab dad dao dar dau dav day dba dbb dbd dbo dbr dbu dbv dby dda ddb ddd ddo ddr ddu ddy doa dob dod doo dor dou dov doy dra drb drd dro drr dru drv dry dua dub dud duo dur duv duy dva dvb dvd dvr dvu dy- dya dyb dyd dyo dyr dyu dyy oaa oab oad oao oar oau oav ob- oba obb obd obo obr obu obv oby oda odb odd odo odr odu odv oo- ooa oob ood ooo oor oov or- ora orb ord oro orr oru orv ory ou- oua oud ouo our ov- ova ovb ovd ovo ovv oya oyd oyo ra- raa rab rad rao rar rau rav ray rba rbb rbd rbo rbr rbu rda rdb rdd rdo rdr rdu rdv rdy roa rob rod roo ror rou rov roy rra rrb rrd rrr rru rua rub rud ruo rur ruu ruv ruy rva rvb rvd rvo rvr rvu rvv rvy ry- rya ryd ryo ryr ryu ryy ua- uaa uab uad uao uar uau uav uay uba ubb ubo ubr ubu ubv uby uda udb udd udo udr udu udv uoa uob uod uoo uor ur- ura urb urd uro urr uru ury uua uur uuu uva uvb uvo uvu uvv uyo uyu v-a vaa vab vad vao var vau vav vay vba vbd vbo vbr vbv vdb vdd vdo vdr vdu vdv voa vob vod voo vor vou vov voy vra vrb vrd vrr vru vry vur vuv vva vvb vvo vvr vvv vyd yaa yab yad yao yar yau yav yay ybr yby yda ydo ydy yob yod yoo yor you yoy yra yro yru yua yud yuo yur yuu yuv yuy yva yvo yvr yvy yyb yyu yyy