a-a a-b aaa aab aad aam aao aar aas ab- aba abb abd abm abo abr abs ad- ada adb add adm ado adr ads ama amb amd amm amo amr ams aoa aob aod aom aoo aor aos ar- ara arb ard arm aro arr ars as- asa asb asd asm aso asr ass baa bab bad bam bao bar bas bba bbb bbd bbm bbo bbr bbs bda bdb bdd bdm bdo bdr bds bma bmb bmd bmm bmo bmr bms boa bob bod bom boo bor bos bra brb brd brm bro brr brs bsa bsb bsd bsm bso bsr bss daa dab dad dam dao dar das dba dbb dbd dbm dbo dbr dbs dda ddb ddd ddm ddo ddr dds dma dmb dmd dmm dmo dmr dms doa dob dod dom doo dor dos dra drb drd drm dro drr drs dsa dsb dsd dsm dso dsr dss m-o m-r maa mab mad mam mao mar mas mba mbb mbd mbm mbo mbr mbs mda mdb mdd mdm mdo mdr mds mma mmb mmd mmm mmo mmr mms moa mob mod mom moo mor mos mra mrb mrd mrm mro mrr mrs msa msb msd msm mso msr mss oaa oab oad oam oao oar oas ob- oba obb obd obm obo obr obs oda odb odd odm odo odr ods om- oma omb omd omm omo omr oms oo- ooa oob ood oom ooo oor oos or- ora orb ord orm oro orr ors os- osa osb osd osm oso osr oss ra- raa rab rad ram rao rar ras rba rbb rbd rbm rbo rbr rbs rda rdb rdd rdm rdo rdr rds rma rmb rmd rmm rmo rmr rms roa rob rod rom roo ror ros rra rrb rrd rrm rrr rrs rsa rsb rsd rsm rso rsr rss saa sab sad sam sao sar sas sba sbb sbd sbm sbo sbr sbs sda sdb sdd sdm sdo sdr sds sma smb smd smm smo smr sms soa sob sod som soo sor sos sr- sra srb srd srm sro srr srs ss- ssa ssb ssd ssm sso ssr sss