-al -ol a-a a-b a-c aaa aab aac aad aak aal aao aas ab- aba abb abc abd abk abl abo abs ac- aca acb acc acd ack acl aco acs ad- ada adb adc add adk adl ado ads aka akb akc akd akk akl ako aks al- ala alb alc ald alk all alo als aoa aob aoc aod aok aol aoo aos as- asa asb asc asd ask asl aso ass baa bab bac bad bak bal bao bas bba bbb bbc bbd bbk bbl bbo bbs bca bcb bcc bcd bck bcl bco bcs bda bdb bdc bdd bdk bdl bdo bds bka bkb bkc bkk bkl bko bks bla blb blc bld blk bll blo bls boa bob boc bod bok bol boo bos bsa bsb bsc bsd bsk bsl bso bss c-- caa cab cac cad cak cal cao cas cba cbb cbc cbd cbk cbl cbo cbs cca ccb ccc ccd cck ccl cco ccs cda cdb cdc cdd cdk cdl cdo cds cka ckb ckc ckd cko cks cl- cla clb clc cld clk cll clo cls co- coa cob coc cod cok col coo cos csa csb csc csd csk csl cso css daa dab dac dad dak dal dao das dba dbb dbc dbd dbk dbl dbo dbs dca dcb dcc dcd dck dcl dco dcs dda ddb ddc ddd ddk ddl ddo dds dka dkb dkc dkk dkl dko dks dl- dla dlb dlc dld dlk dll dlo dls doa dob doc dod dok dol doo dos dsa dsb dsc dsd dsk dsl dso dss ka- kaa kab kac kad kak kal kao kas kba kbb kbc kbd kbk kbl kbo kbs kca kcb kcc kcd kck kcl kcs kda kdb kdc kdk kdl kdo kds kkb kkc kkk kkl kks kl- kla klb klc kld klo kls koa kob koc kod kok kol koo kos ksa ksb ksc ksd ksk ksl kso kss la- laa lab lac lad lak lal lao las lba lbb lbc lbd lbk lbl lbo lbs lca lcb lcc lcd lck lcl lco lcs lda ldb ldc ldd ldk ldl ldo lds lka lkb lkl lks lla llb llc lld llk lll llo lls loa lob loc lod lok lol loo los lsa lsb lsc lsd lsk lsl lso lss oaa oab oac oad oak oal oao oas ob- oba obb obc obd obk obl obo obs oc- oca ocb occ ocd ock ocl oco ocs oda odb odc odd odl odo ods oka okb okc okd okk okl oko oks ola olb olc old olk oll olo ols oo- ooa oob ooc ood ook ool ooo oos os- osa osb osc osd osk osl oso oss saa sab sac sad sak sal sao sas sba sbb sbc sbd sbk sbl sbo sbs sca scb scc scd sck scl sco scs sda sdb sdc sdd sdk sdl sdo sds sk- ska skb skc skd skk skl sko sks sla slb slc sld slk sll slo sls soa sob soc sod sok sol soo sos ss- ssa ssb ssc ssd ssk ssl sso sss