a-a a-b aaa aab aak aam aar aas ab- aba abb abk abm abr abs aka akb akk akm akr aks ama amb amk amm amr ams ar- ara arb ark arm arr ars as- asa asb ask asm asr ass baa bab bak bam bar bas bba bbb bbk bbm bbr bbs bka bkb bkk bkm bkr bks bma bmb bmk bmm bmr bms bra brb brk brm brr brs bsa bsb bsk bsm bsr bss ka- kaa kab kak kam kar kas kba kbb kbk kbm kbr kbs kkb kkk kkm kkr kks kma kmb kmk kmm kms kra krk krr krs ksa ksb ksk ksm ksr kss m-r maa mab mak mam mar mas mba mbb mbk mbm mbr mbs mka mkb mkk mkm mkr mks mma mmb mmk mmm mmr mms mra mrb mrk mrm mrr mrs msa msb msk msm msr mss ra- raa rab rak ram rar ras rba rbb rbk rbm rbr rbs rkb rkk rkm rks rma rmb rmm rmr rms rra rrb rrk rrm rrr rrs rsa rsb rsk rsm rsr rss saa sab sak sam sar sas sba sbb sbk sbm sbr sbs sk- ska skb skk skm skr sks sma smb smk smm smr sms sr- sra srb srk srm srr srs ss- ssa ssb ssk ssm ssr sss