a-a a-b aaa aab aam aao aar aas aav ab- aba abb abm abo abr abs abv ama amb amm amo amr ams amv aoa aob aom aoo aor aos aov ar- ara arb arm aro arr ars arv as- asa asb asm aso asr ass asv av- ava avb avm avo avr avs baa bab bam bao bar bas bav bba bbb bbm bbo bbr bbs bma bmb bmm bmo bmr bms bmv boa bob bom boo bor bos bov bra brb brm bro brr brs brv bsa bsb bsm bso bsr bss bsv bva bvb bvm bvo bvr bvs bvv m-o m-r m-v maa mab mam mao mar mas mav mba mbb mbm mbo mbr mbs mbv mma mmb mmm mmo mmr mms mmv moa mob mom moo mor mos mov mra mrb mrm mro mrr mrs mrv msa msb msm mso msr mss msv mva mvb mvm mvo mvr mvs mvv oaa oab oam oao oar oas oav ob- oba obb obm obo obr obs obv om- oma omb omm omo omr oms omv oo- ooa oob oom ooo oor oos oov or- ora orb orm oro orr ors orv os- osa osb osm oso osr oss osv ov- ova ovb ovo ovs ovv ra- raa rab ram rao rar ras rav rba rbb rbm rbo rbr rbs rma rmb rmm rmo rmr rms rmv roa rob rom roo ror ros rov rra rrb rrm rrr rrs rsa rsb rsm rso rsr rss rsv rva rvb rvm rvo rvr rvs rvv saa sab sam sao sar sas sav sba sbb sbm sbo sbr sbs sbv sma smb smm smo smr sms smv soa sob som soo sor sos sov sr- sra srb srm sro srr srs srv ss- ssa ssb ssm sso ssr sss ssv sva svb svm svo svr svs svv v-a vaa vab vam vao var vas vav vba vbm vbo vbr vbs vbv vm- vma vmm vmo vmr voa vob vom voo vor vos vov vra vrb vrm vrr vrs vsa vsb vsm vso vsr vss vsv vva vvb vvm vvo vvr vvs vvv