a-a a-b aaa aab aam aan aao aar aas ab- aba abb abm abn abo abr abs ama amb amm amn amo amr ams an- ana anb anm ann ano anr ans aoa aob aom aon aoo aor aos ar- ara arb arm arn aro arr ars as- asa asb asm asn aso asr ass baa bab bam ban bao bar bas bba bbb bbm bbn bbo bbr bbs bma bmb bmm bmn bmo bmr bms bna bnb bnn bno bnr bns boa bob bom bon boo bor bos bra brb brm brn bro brr brs bsa bsb bsm bsn bso bsr bss m-o m-r maa mab mam man mao mar mas mba mbb mbm mbo mbr mbs mma mmb mmm mmn mmo mmr mms mna mnb mnm mnn mno mnr mns moa mob mom mon moo mor mos mra mrb mrm mrn mro mrr mrs msa msb msm msn mso msr mss naa nab nam nan nao nar nas nba nbb nbm nbn nbo nbr nbs nma nmb nmm nmn nmo nmr nms nna nnb nnm nnn nno nns no- noa nob nom non noo nor nos nra nrb nrm nrn nro nrr nrs nsa nsb nsm nsn nso nsr nss oaa oab oam oan oao oar oas ob- oba obb obm obn obo obr obs om- oma omb omm omn omo omr oms on- ona onb onn ono onr ons oo- ooa oob oom oon ooo oor oos or- ora orb orm orn oro orr ors os- osa osb osm osn oso osr oss ra- raa rab ram ran rao rar ras rba rbb rbm rbn rbo rbr rbs rma rmb rmm rmn rmo rmr rms rna rnb rnm rnn rno rnr rns roa rob rom ron roo ror ros rra rrb rrm rrn rrr rrs rsa rsb rsm rsn rso rsr rss saa sab sam san sao sar sas sba sbb sbm sbn sbo sbr sbs sma smb smm smn smo smr sms sna snb snm snn sno snr sns soa sob som son soo sor sos sr- sra srb srm srn sro srr srs ss- ssa ssb ssm ssn sso ssr sss