a-a a-b aaa aab aag aan aao aar aau aav ab- aba abb abg abn abo abr abu abv ag- aga agb agg agn ago agr agu agv an- ana anb ang ann ano anr anu anv aoa aob aog aon aoo aor aou aov ar- ara arb arg arn aro arr aru arv au- aua aub aug aun auo aur auv av- ava avb avg avn avo avr avu b-u baa bab bag ban bao bar bau bav bba bbb bbg bbn bbo bbr bbu bga bgb bgg bgn bgo bgr bgu bgv bna bnb bng bnn bno bnr bnu bnv boa bob bog bon boo bor bou bov bra brb brg brn bro brr bru brv bua bub bug bun buo bur buu bva bvb bvg bvn bvo bvr bvu bvv gaa gab gag gan gao gar gau gav gba gbg gbn gbo gbr gbu gbv gga ggb ggg ggn ggo ggr ggu ggv gna gnb gnn gno gnr gnu gnv goa gob gog gon goo gor gou gov gra grb grg grn gro grr gru grv gu- gua gub gug gun guo gur guu guv gva gvb gvg gvn gvo gvr gvu naa nab nag nan nao nar nau nav nba nbb nbg nbn nbo nbr nbu nbv nga ngb ngg ngn ngo ngu nna nnb nng nnn nno nnu nnv no- noa nob nog non noo nor nou nov nra nrb nrg nrn nro nrr nru nrv nua nub nug nun nuo nur nuu nuv nva nvb nvg nvn nvu nvv oaa oab oag oan oao oar oau oav ob- oba obb obg obn obo obr obu obv oga ogg ogn ogo on- ona onb ong onn ono onr onu oo- ooa oob oog oon ooo oor oov or- ora orb org orn oro orr oru orv ou- oua oun ouo our ov- ova ovb ovo ovv ra- raa rab rag ran rao rar rau rav rba rbb rbg rbn rbo rbr rbu rga rgb rgg rgn rgo rgr rgv rna rnb rng rnn rno rnr rnu rnv roa rob rog ron roo ror rou rov rra rrb rrg rrn rrr rru rua rub rug run ruo rur ruu ruv rva rvb rvg rvn rvo rvr rvu rvv ua- uaa uab uag uan uao uar uau uav uba ubb ubg ubn ubo ubr ubu ubv uga ugb ugg ugn ugo ugr ugu un- una unb ung unn uno unr unu unv uoa uob uog uon uoo uor ur- ura urb urg urn uro urr uru uua uug uun uur uuu uva uvb uvo uvu uvv v-a vaa vab vag van vao var vau vav vba vbg vbo vbr vbv vga vgg vgn vgo vgr vgu vn- vna vng vno vnr vnu vnv voa vob vog von voo vor vou vov vra vrb vrg vrn vrr vru vug vur vuv vva vvb vvg vvo vvr vvv