a-a a-b a-c aaa aab aac aad aak aam aas ab- aba abb abc abd abk abm abs ac- aca acb acc acd ack acm acs ad- ada adb adc add adk adm ads aka akb akc akd akk akm aks ama amb amc amd amk amm ams as- asa asb asc asd ask asm ass baa bab bac bad bak bam bas bba bbb bbc bbd bbk bbm bbs bca bcb bcc bcd bck bcm bcs bda bdb bdc bdd bdk bdm bds bka bkb bkc bkk bkm bks bma bmb bmc bmd bmk bmm bms bsa bsb bsc bsd bsk bsm bss c-- caa cab cac cad cak cam cas cba cbb cbc cbd cbk cbm cbs cca ccb ccc ccd cck ccm ccs cda cdb cdc cdd cdk cdm cds cka ckb ckc ckd ckm cks cma cmb cmc cmd cmk cmm cms csa csb csc csd csk csm css daa dab dac dad dak dam das dba dbb dbc dbd dbk dbm dbs dca dcb dcc dcd dck dcm dcs dda ddb ddc ddd ddk ddm dds dka dkb dkc dkk dkm dks dma dmb dmc dmd dmk dmm dms dsa dsb dsc dsd dsk dsm dss ka- kaa kab kac kad kak kam kas kba kbb kbc kbd kbk kbm kbs kca kcb kcc kcd kck kcm kcs kda kdb kdc kdk kdm kds kkb kkc kkk kkm kks kma kmb kmc kmd kmk kmm kms ksa ksb ksc ksd ksk ksm kss maa mab mac mad mak mam mas mba mbb mbc mbd mbk mbm mbs mc- mca mcb mcc mcd mck mcm mcs mda mdb mdc mdd mdk mdm mds mka mkb mkc mkd mkk mkm mks mma mmb mmc mmd mmk mmm mms msa msb msc msd msk msm mss saa sab sac sad sak sam sas sba sbb sbc sbd sbk sbm sbs sca scb scc scd sck scm scs sda sdb sdc sdd sdk sdm sds sk- ska skb skc skd skk skm sks sma smb smc smd smk smm sms ss- ssa ssb ssc ssd ssk ssm sss