a-a a-b a-t aaa aab aan aao aar aat aav ab- aba abb abn abo abr abt abv an- ana anb ann ano anr ant anv aoa aob aon aoo aor aot aov ar- ara arb arn aro arr art arv at- ata atb atn ato atr att atv av- ava avb avn avo avr avt baa bab ban bao bar bat bav bba bbb bbn bbo bbr bbt bna bnb bnn bno bnr bnt bnv boa bob bon boo bor bot bov bra brb brn bro brr brt brv bta btb btn bto btr btt btv bva bvb bvn bvo bvr bvt bvv naa nab nan nao nar nat nav nba nbb nbn nbo nbr nbt nbv nna nnb nnn nno nnt nnv no- noa nob non noo nor not nov nra nrb nrn nro nrr nrt nrv nta ntb ntn nto ntr ntt ntv nva nvb nvn nvt nvv oaa oab oan oao oar oat oav ob- oba obb obn obo obr obt obv on- ona onb onn ono onr ont oo- ooa oob oon ooo oor oot oov or- ora orb orn oro orr ort orv ot- ota otb otn oto otr ott otv ov- ova ovb ovo ovv ra- raa rab ran rao rar rat rav rba rbb rbn rbo rbr rbt rna rnb rnn rno rnr rnt rnv roa rob ron roo ror rot rov rra rrb rrn rrr rrt rta rtb rtn rto rtr rtt rtv rva rvb rvn rvo rvr rvt rvv taa tab tan tao tar tat tav tba tbb tbn tbo tbr tbt tbv tna tnb tnn tno tnr tnt to- toa tob ton too tor tot tov tra trb trn tro trr trt trv tta ttb ttn tto ttr ttt ttv tva tvb tvn tvo tvr tvt v-a vaa vab van vao var vat vav vba vbo vbr vbv vn- vna vno vnr vnv voa vob von voo vor vot vov vra vrb vrn vrr vrt vta vtb vto vtr vtt vtv vva vvb vvo vvr vvt vvv