a-a a-b aaa aab aan aao aar aav aay ab- aba abb abn abo abr abv aby an- ana anb ann ano anr anv any aoa aob aon aoo aor aov ar- ara arb arn aro arr arv ary av- ava avb avn avo avr avy ay- aya ayn ayo ayr baa bab ban bao bar bav bay bba bbb bbn bbo bbr bby bna bnb bnn bno bnr bnv boa bob bon boo bor bov boy bra brb brn bro brr brv bry bva bvb bvn bvo bvr bvv by- bya byn byo byr naa nab nan nao nar nav nay nba nbb nbn nbo nbr nbv nna nnb nnn nno nnv no- noa nob non noo nor nov noy nra nrb nrn nro nrr nrv nry nva nvb nvn nvv nya nyn nyo nyy oaa oab oan oao oar oav ob- oba obb obn obo obr obv oby on- ona onb onn ono onr ony oo- ooa oob oon ooo oor oov or- ora orb orn oro orr orv ory ov- ova ovb ovo ovv oya oyo ra- raa rab ran rao rar rav ray rba rbb rbn rbo rbr rna rnb rnn rno rnr rnv rny roa rob ron roo ror rov roy rra rrb rrn rrr rva rvb rvn rvo rvr rvv rvy ry- rya ryn ryo ryr ryy v-a vaa vab van vao var vav vay vba vbo vbr vbv vn- vna vno vnr vnv voa vob von voo vor vov voy vra vrb vrn vrr vry vva vvb vvo vvr vvv vyn yaa yab yan yao yar yav yay ybr yby yna ynn yny yob yon yoo yor yoy yra yrn yro yva yvo yvr yvy yyb yyy