-al a-a a-b a-c aaa aab aac aad aak aal aas ab- aba abb abc abd abk abl abs ac- aca acb acc acd ack acl acs ad- ada adb adc add adk adl ads aka akb akc akd akk akl aks al- ala alb alc ald alk all als as- asa asb asc asd ask asl ass baa bab bac bad bak bal bas bba bbb bbc bbd bbk bbl bbs bca bcb bcc bcd bck bcl bcs bda bdb bdc bdd bdk bdl bds bka bkb bkc bkk bkl bks bla blb blc bld blk bll bls bsa bsb bsc bsd bsk bsl bss c-- caa cab cac cad cak cal cas cba cbb cbc cbd cbk cbl cbs cca ccb ccc ccd cck ccl ccs cda cdb cdc cdd cdk cdl cds cka ckb ckc ckd cks cl- cla clb clc cld clk cll cls csa csb csc csd csk csl css daa dab dac dad dak dal das dba dbb dbc dbd dbk dbl dbs dca dcb dcc dcd dck dcl dcs dda ddb ddc ddd ddk ddl dds dka dkb dkc dkk dkl dks dl- dla dlb dlc dld dlk dll dls dsa dsb dsc dsd dsk dsl dss ka- kaa kab kac kad kak kal kas kba kbb kbc kbd kbk kbl kbs kca kcb kcc kcd kck kcl kcs kda kdb kdc kdk kdl kds kkb kkc kkk kkl kks kl- kla klb klc kld kls ksa ksb ksc ksd ksk ksl kss la- laa lab lac lad lak lal las lba lbb lbc lbd lbk lbl lbs lca lcb lcc lcd lck lcl lcs lda ldb ldc ldd ldk ldl lds lka lkb lkl lks lla llb llc lld llk lll lls lsa lsb lsc lsd lsk lsl lss saa sab sac sad sak sal sas sba sbb sbc sbd sbk sbl sbs sca scb scc scd sck scl scs sda sdb sdc sdd sdk sdl sds sk- ska skb skc skd skk skl sks sla slb slc sld slk sll sls ss- ssa ssb ssc ssd ssk ssl sss