a-a a-b aaa aab aad aak aam aar aas ab- aba abb abd abk abm abr abs ad- ada adb add adk adm adr ads aka akb akd akk akm akr aks ama amb amd amk amm amr ams ar- ara arb ard ark arm arr ars as- asa asb asd ask asm asr ass baa bab bad bak bam bar bas bba bbb bbd bbk bbm bbr bbs bda bdb bdd bdk bdm bdr bds bka bkb bkk bkm bkr bks bma bmb bmd bmk bmm bmr bms bra brb brd brk brm brr brs bsa bsb bsd bsk bsm bsr bss daa dab dad dak dam dar das dba dbb dbd dbk dbm dbr dbs dda ddb ddd ddk ddm ddr dds dka dkb dkk dkm dkr dks dma dmb dmd dmk dmm dmr dms dra drb drd drk drm drr drs dsa dsb dsd dsk dsm dsr dss ka- kaa kab kad kak kam kar kas kba kbb kbd kbk kbm kbr kbs kda kdb kdk kdm kdr kds kkb kkk kkm kkr kks kma kmb kmd kmk kmm kms kra krd krk krr krs ksa ksb ksd ksk ksm ksr kss m-r maa mab mad mak mam mar mas mba mbb mbd mbk mbm mbr mbs mda mdb mdd mdk mdm mdr mds mka mkb mkd mkk mkm mkr mks mma mmb mmd mmk mmm mmr mms mra mrb mrd mrk mrm mrr mrs msa msb msd msk msm msr mss ra- raa rab rad rak ram rar ras rba rbb rbd rbk rbm rbr rbs rda rdb rdd rdm rdr rds rkb rkk rkm rks rma rmb rmd rmm rmr rms rra rrb rrd rrk rrm rrr rrs rsa rsb rsd rsk rsm rsr rss saa sab sad sak sam sar sas sba sbb sbd sbk sbm sbr sbs sda sdb sdd sdk sdm sdr sds sk- ska skb skd skk skm skr sks sma smb smd smk smm smr sms sr- sra srb srd srk srm srr srs ss- ssa ssb ssd ssk ssm ssr sss