a-a a-b aaa aab aah aan aao aar aav ab- aba abb abh abn abo abr abv aha ahb ahh ahn aho ahr ahv an- ana anb anh ann ano anr anv aoa aob aoh aon aoo aor aov ar- ara arb arh arn aro arr arv av- ava avb avh avn avo avr baa bab bah ban bao bar bav bba bbb bbh bbn bbo bbr bha bhb bhh bho bhr bhv bna bnb bnn bno bnr bnv boa bob boh bon boo bor bov bra brb brh brn bro brr brv bva bvb bvh bvn bvo bvr bvv haa hab hah han hao har hav hba hbb hbh hbn hbo hbr hbv hha hhb hhh hhn hho hhr hhv hna hnb hnh hnn hno hnv hoa hob hoh hon hoo hor hov hr- hra hrb hrh hrn hro hrr hrv hv- hva hvb hvn hvo hvr hvv naa nab nah nan nao nar nav nba nbb nbn nbo nbr nbv nha nhb nhh nhn nhr nhv nna nnb nnh nnn nno nnv no- noa nob noh non noo nor nov nra nrb nrn nro nrr nrv nva nvb nvh nvn nvv oaa oab oah oan oao oar oav ob- oba obb obh obn obo obr obv oha ohh ohn oho ohr on- ona onb onh onn ono onr oo- ooa oob ooh oon ooo oor oov or- ora orb orh orn oro orr orv ov- ova ovb ovh ovo ovv ra- raa rab rah ran rao rar rav rba rbb rbh rbn rbo rbr rh- rha rhb rhh rhn rho rhr rhv rna rnb rnh rnn rno rnr rnv roa rob roh ron roo ror rov rra rrb rrh rrn rrr rva rvb rvh rvn rvo rvr rvv v-a vaa vab vah van vao var vav vba vbh vbo vbr vbv vh- vha vhb vho vn- vna vno vnr vnv voa vob voh von voo vor vov vra vrb vrh vrn vrr vva vvb vvo vvr vvv