a-a a-b a-c a-t aaa aab aac aaf aao aar aat aav ab- aba abb abc abf abo abr abt abv ac- aca acb acc acf aco acr act acv af- afa afb afc aff afo afr aft afv aoa aob aoc aof aoo aor aot aov ar- ara arb arc arf aro arr art arv at- ata atb atc atf ato atr att atv av- ava avb avc avf avo avr avt baa bab bac baf bao bar bat bav bba bbb bbc bbf bbo bbr bbt bca bcb bcc bcf bco bcr bct bcv bfa bfb bfc bff bfo bfr bft bfv boa bob boc bof boo bor bot bov bra brb brf bro brr brt brv bta btb btc btf bto btr btt btv bva bvb bvc bvo bvr bvt bvv c-- caa cab cac caf cao car cat cav cba cbb cbc cbf cbo cbr cbt cbv cca ccb ccc ccf cco ccr cct ccv cfa cfb cfc cff cfo cfr cft cfv co- coa cob coc cof coo cor cot cov cra crb crc crf cro crr crt crv cta ctb ctc ctf cto ctr ctt ctv cva cvb cvc cvf cvo cvr cvt cvv faa fab fac faf fao far fat fav fba fbb fbc fbf fbo fbr fbt fca fcb fcc fcf fco fcr fct fcv ffa ffc fff ffo ffr fft ffv foa fob foc fof foo for fot fra frb frc frf fro frr frt fta ftb ftc ftf fto ftr ftt ftv fva fvc fvt oaa oab oac oaf oao oar oat oav ob- oba obb obc obf obo obr obt obv oc- oca ocb occ ocf oco ocr oct ocv of- ofa ofb ofc off ofo ofr oft ofv oo- ooa oob ooc oof ooo oor oot oov or- ora orb orc orf oro orr ort orv ot- ota otb otc otf oto otr ott otv ov- ova ovb ovc ovf ovo ovv ra- raa rab rac raf rao rar rat rav rba rbb rbc rbf rbo rbr rbt rca rcb rcc rcf rco rcr rct rcv rfa rfb rfc rff rfo rfr rft rfv roa rob roc rof roo ror rot rov rra rrb rrc rrf rrr rrt rta rtb rtc rtf rto rtr rtt rtv rva rvb rvc rvf rvo rvr rvt rvv taa tab tac taf tao tar tat tav tba tbb tbc tbf tbo tbr tbt tbv tca tcb tcc tcf tco tcr tct tcv tfa tfb tfc tff tfo tfr tft to- toa tob toc tof too tor tot tov tra trb trc trf tro trr trt trv tta ttb ttc ttf tto ttr ttt ttv tva tvb tvc tvf tvo tvr tvt v-a vaa vab vac vao var vat vav vba vbc vbo vbr vbv vca vcc vcf vco vcr vct vfa vfb vfc vff vfr vft vfv voa vob voc vof voo vor vot vov vra vrb vrc vrf vrr vrt vta vtb vtc vto vtr vtt vtv vva vvb vvc vvo vvr vvt vvv