a-a a-b aaa aab aad aan aar aau aav ab- aba abb abd abn abr abu abv ad- ada adb add adn adr adu adv an- ana anb and ann anr anu anv ar- ara arb ard arn arr aru arv au- aua aub aud aun aur auv av- ava avb avd avn avr avu b-u baa bab bad ban bar bau bav bba bbb bbd bbn bbr bbu bda bdb bdd bdr bdu bdv bna bnb bnd bnn bnr bnu bnv bra brb brd brn brr bru brv bua bub bud bun bur buu bva bvb bvd bvn bvr bvu bvv daa dab dad dan dar dau dav dba dbb dbd dbn dbr dbu dbv dda ddb ddd ddn ddr ddu dna dnb dnd dnn dnr dra drb drd drn drr dru drv dua dub dud dun dur duv dva dvb dvd dvn dvr dvu naa nab nad nan nar nau nav nba nbb nbd nbn nbr nbu nbv nda ndb ndd ndn ndr ndu ndv nna nnb nnn nnu nnv nra nrb nrd nrn nrr nru nrv nua nub nud nun nur nuu nuv nva nvb nvd nvn nvu nvv ra- raa rab rad ran rar rau rav rba rbb rbd rbn rbr rbu rda rdb rdd rdn rdr rdu rdv rna rnb rnd rnn rnr rnu rnv rra rrb rrd rrn rrr rru rua rub rud run rur ruu ruv rva rvb rvd rvn rvr rvu rvv ua- uaa uab uad uan uar uau uav uba ubb ubn ubr ubu ubv uda udb udd udn udr udu udv un- una unb und unn unr unu unv ur- ura urb urd urn urr uru uua uun uur uuu uva uvb uvu uvv v-a vaa vab vad van var vau vav vba vbd vbr vbv vdb vdd vdr vdu vdv vn- vna vnd vnr vnu vnv vra vrb vrd vrn vrr vru vur vuv vva vvb vvr vvv