-al a-a a-b a-c aaa aab aac aad aal aas ab- aba abb abc abd abl abs ac- aca acb acc acd acl acs ad- ada adb adc add adl ads al- ala alb alc ald all als as- asa asb asc asd asl ass baa bab bac bad bal bas bba bbb bbc bbd bbl bbs bca bcb bcc bcd bcl bcs bda bdb bdc bdd bdl bds bla blb blc bld bll bls bsa bsb bsc bsd bsl bss c-- caa cab cac cad cal cas cba cbb cbc cbd cbl cbs cca ccb ccc ccd ccl ccs cda cdb cdc cdd cdl cds cl- cla clb clc cld cll cls csa csb csc csd csl css daa dab dac dad dal das dba dbb dbc dbd dbl dbs dca dcb dcc dcd dcl dcs dda ddb ddc ddd ddl dds dl- dla dlb dlc dld dll dls dsa dsb dsc dsd dsl dss la- laa lab lac lad lal las lba lbb lbc lbd lbl lbs lca lcb lcc lcd lcl lcs lda ldb ldc ldd ldl lds lla llb llc lld lll lls lsa lsb lsc lsd lsl lss saa sab sac sad sal sas sba sbb sbc sbd sbl sbs sca scb scc scd scl scs sda sdb sdc sdd sdl sds sla slb slc sld sll sls ss- ssa ssb ssc ssd ssl sss