a-a a-b a-i a-t aaa aab aag aai aao aar aas aat aav ab- aba abb abg abi abo abr abs abt abv ag- aga agb agg agi ago agr ags agt agv ai- aia aib aig aii aio air ais ait aiv aoa aob aog aoi aoo aor aos aot aov ar- ara arb arg ari aro arr ars art arv as- asa asb asg asi aso asr ass ast asv at- ata atb atg ati ato atr ats att atv av- ava avb avg avi avo avr avs avt baa bab bag bai bao bar bas bat bav bba bbb bbg bbi bbo bbr bbs bbt bga bgb bgg bgi bgo bgr bgs bgt bgv bi- bia bib big bii bio bir bis bit biv boa bob bog boi boo bor bos bot bov bra brb brg bri bro brr brs brt brv bsa bsb bsg bsi bso bsr bss bst bsv bta btb btg bti bto btr bts btt btv bva bvb bvg bvi bvo bvr bvs bvt bvv gaa gab gag gai gao gar gas gat gav gba gbg gbi gbo gbr gbs gbt gbv gga ggb ggg ggi ggo ggr ggs ggt ggv gia gib gig gii gio gir gis git giv goa gob gog goi goo gor gos got gov gra grb grg gri gro grr grs grt grv gsa gsb gsg gsi gso gsr gss gst gsv gta gtb gtg gti gto gtr gts gtt gtv gva gvb gvg gvi gvo gvr gvs gvt i-v ia- iaa iab iag iai iao iar ias iat iav iba ibb ibg ibi ibo ibr ibs ibt ibv iga igb igg igi igo igr igs igt iia iib iii iio iir iis iit io- ioa iob iog ioi ioo ior ios iot iov ir- ira irb irg iri iro irr irs irt irv is- isa isb isg isi iso isr iss ist isv ita itb itg iti ito its itt itv iva ivb ivg ivi ivo ivr ivs ivt ivv o-i oaa oab oag oai oao oar oas oat oav ob- oba obb obg obi obo obr obs obt obv oga ogg ogi ogo ogs ogt oia oib oii oio oir ois oit oiv oo- ooa oob oog ooi ooo oor oos oot oov or- ora orb org ori oro orr ors ort orv os- osa osb osg osi oso osr oss ost osv ot- ota otb otg oti oto otr ots ott otv ov- ova ovb ovi ovo ovs ovv ra- raa rab rag rai rao rar ras rat rav rba rbb rbg rbi rbo rbr rbs rbt rga rgb rgg rgi rgo rgr rgs rgt rgv ria rib rig rii rio rir ris rit riv roa rob rog roi roo ror ros rot rov rra rrb rrg rri rrr rrs rrt rsa rsb rsg rsi rso rsr rss rst rsv rta rtb rtg rti rto rtr rts rtt rtv rva rvb rvg rvi rvo rvr rvs rvt rvv saa sab sag sai sao sar sas sat sav sba sbb sbg sbi sbo sbr sbs sbt sbv sga sgb sgg sgi sgo sgr sgs sgt sgv sia sib sig sii sio sir sis sit siv soa sob sog soi soo sor sos sot sov sr- sra srb srg sri sro srr srs srt srv ss- ssa ssb ssg ssi sso ssr sss sst ssv sta stb stg sti sto str sts stt stv sva svb svg svi svo svr svs svt svv taa tab tag tai tao tar tas tat tav tba tbb tbg tbi tbo tbr tbs tbt tbv tga tgb tgg tgi tgo tgr tgs tgt tgv tia tib tig tii tio tir tis tit tiv to- toa tob tog toi too tor tos tot tov tra trb trg tri tro trr trs trt trv tsa tsb tsg tsi tso tsr tss tst tsv tta ttb ttg tti tto ttr tts ttt ttv tva tvb tvg tvi tvo tvr tvs tvt v-a vaa vab vag vai vao var vas vat vav vba vbg vbi vbo vbr vbs vbv vga vgg vgo vgr vgs vgt vi- via vib vig vii vio vir vis vit viv voa vob vog voi voo vor vos vot vov vra vrb vrg vri vrr vrs vrt vsa vsb vsg vsi vso vsr vss vst vsv vta vtb vtg vti vto vtr vts vtt vtv vva vvb vvg vvi vvo vvr vvs vvt vvv