a-a a-b a-c aaa aab aac aad aam aao aar aas ab- aba abb abc abd abm abo abr abs ac- aca acb acc acd acm aco acr acs ad- ada adb adc add adm ado adr ads ama amb amc amd amm amo amr ams aoa aob aoc aod aom aoo aor aos ar- ara arb arc ard arm aro arr ars as- asa asb asc asd asm aso asr ass baa bab bac bad bam bao bar bas bba bbb bbc bbd bbm bbo bbr bbs bca bcb bcc bcd bcm bco bcr bcs bda bdb bdc bdd bdm bdo bdr bds bma bmb bmc bmd bmm bmo bmr bms boa bob boc bod bom boo bor bos bra brb brd brm bro brr brs bsa bsb bsc bsd bsm bso bsr bss c-- caa cab cac cad cam cao car cas cba cbb cbc cbd cbm cbo cbr cbs cca ccb ccc ccd ccm cco ccr ccs cda cdb cdc cdd cdm cdo cdr cds cma cmb cmc cmd cmm cmo cmr cms co- coa cob coc cod com coo cor cos cra crb crc crd crm cro crr crs csa csb csc csd csm cso csr css daa dab dac dad dam dao dar das dba dbb dbc dbd dbm dbo dbr dbs dca dcb dcc dcd dcm dco dcr dcs dda ddb ddc ddd ddm ddo ddr dds dma dmb dmc dmd dmm dmo dmr dms doa dob doc dod dom doo dor dos dra drb drc drd drm dro drr drs dsa dsb dsc dsd dsm dso dsr dss m-o m-r maa mab mac mad mam mao mar mas mba mbb mbc mbd mbm mbo mbr mbs mc- mca mcb mcc mcd mcm mco mcr mcs mda mdb mdc mdd mdm mdo mdr mds mma mmb mmc mmd mmm mmo mmr mms moa mob moc mod mom moo mor mos mra mrb mrc mrd mrm mro mrr mrs msa msb msc msd msm mso msr mss oaa oab oac oad oam oao oar oas ob- oba obb obc obd obm obo obr obs oc- oca ocb occ ocd ocm oco ocr ocs oda odb odc odd odm odo odr ods om- oma omb omc omd omm omo omr oms oo- ooa oob ooc ood oom ooo oor oos or- ora orb orc ord orm oro orr ors os- osa osb osc osd osm oso osr oss ra- raa rab rac rad ram rao rar ras rba rbb rbc rbd rbm rbo rbr rbs rca rcb rcc rcd rcm rco rcr rcs rda rdb rdc rdd rdm rdo rdr rds rma rmb rmc rmd rmm rmo rmr rms roa rob roc rod rom roo ror ros rra rrb rrc rrd rrm rrr rrs rsa rsb rsc rsd rsm rso rsr rss saa sab sac sad sam sao sar sas sba sbb sbc sbd sbm sbo sbr sbs sca scb scc scd scm sco scr scs sda sdb sdc sdd sdm sdo sdr sds sma smb smc smd smm smo smr sms soa sob soc sod som soo sor sos sr- sra srb src srd srm sro srr srs ss- ssa ssb ssc ssd ssm sso ssr sss