a-a a-b a-c a-t aaa aab aac aao aar aas aat aav ab- aba abb abc abo abr abs abt abv ac- aca acb acc aco acr acs act acv aoa aob aoc aoo aor aos aot aov ar- ara arb arc aro arr ars art arv as- asa asb asc aso asr ass ast asv at- ata atb atc ato atr ats att atv av- ava avb avc avo avr avs avt baa bab bac bao bar bas bat bav bba bbb bbc bbo bbr bbs bbt bca bcb bcc bco bcr bcs bct bcv boa bob boc boo bor bos bot bov bra brb bro brr brs brt brv bsa bsb bsc bso bsr bss bst bsv bta btb btc bto btr bts btt btv bva bvb bvc bvo bvr bvs bvt bvv c-- caa cab cac cao car cas cat cav cba cbb cbc cbo cbr cbs cbt cbv cca ccb ccc cco ccr ccs cct ccv co- coa cob coc coo cor cos cot cov cra crb crc cro crr crs crt crv csa csb csc cso csr css cst csv cta ctb ctc cto ctr cts ctt ctv cva cvb cvc cvo cvr cvs cvt cvv oaa oab oac oao oar oas oat oav ob- oba obb obc obo obr obs obt obv oc- oca ocb occ oco ocr ocs oct ocv oo- ooa oob ooc ooo oor oos oot oov or- ora orb orc oro orr ors ort orv os- osa osb osc oso osr oss ost osv ot- ota otb otc oto otr ots ott otv ov- ova ovb ovc ovo ovs ovv ra- raa rab rac rao rar ras rat rav rba rbb rbc rbo rbr rbs rbt rca rcb rcc rco rcr rcs rct rcv roa rob roc roo ror ros rot rov rra rrb rrc rrr rrs rrt rsa rsb rsc rso rsr rss rst rsv rta rtb rtc rto rtr rts rtt rtv rva rvb rvc rvo rvr rvs rvt rvv saa sab sac sao sar sas sat sav sba sbb sbc sbo sbr sbs sbt sbv sca scb scc sco scr scs sct scv soa sob soc soo sor sos sot sov sr- sra srb src sro srr srs srt srv ss- ssa ssb ssc sso ssr sss sst ssv sta stb stc sto str sts stt stv sva svb svc svo svr svs svt svv taa tab tac tao tar tas tat tav tba tbb tbc tbo tbr tbs tbt tbv tca tcb tcc tco tcr tcs tct tcv to- toa tob toc too tor tos tot tov tra trb trc tro trr trs trt trv tsa tsb tsc tso tsr tss tst tsv tta ttb ttc tto ttr tts ttt ttv tva tvb tvc tvo tvr tvs tvt v-a vaa vab vac vao var vas vat vav vba vbc vbo vbr vbs vbv vca vcc vco vcr vcs vct voa vob voc voo vor vos vot vov vra vrb vrc vrr vrs vrt vsa vsb vsc vso vsr vss vst vsv vta vtb vtc vto vtr vts vtt vtv vva vvb vvc vvo vvr vvs vvt vvv