-al -ic -ol a-a a-b a-c a-i aaa aab aac aai aak aal aao aas ab- aba abb abc abi abk abl abo abs ac- aca acb acc aci ack acl aco acs ai- aia aib aic aii aik ail aio ais aka akb akc aki akk akl ako aks al- ala alb alc ali alk all alo als aoa aob aoc aoi aok aol aoo aos as- asa asb asc asi ask asl aso ass baa bab bac bai bak bal bao bas bba bbb bbc bbi bbk bbl bbo bbs bca bcb bcc bci bck bcl bco bcs bi- bia bib bic bii bik bil bio bis bka bkb bkc bkk bkl bko bks bla blb blc bli blk bll blo bls boa bob boc boi bok bol boo bos bsa bsb bsc bsi bsk bsl bso bss c-- caa cab cac cai cak cal cao cas cba cbb cbc cbi cbk cbl cbo cbs cca ccb ccc cci cck ccl cco ccs ci- cia cib cic cii cik cil cio cis cka ckb ckc cki cko cks cl- cla clb clc cli clk cll clo cls co- coa cob coc coi cok col coo cos csa csb csc csi csk csl cso css ia- iaa iab iac iai ial iao ias iba ibb ibc ibi ibk ibl ibo ibs ica icb icc ici ick icl ico ics iia iib iic iii iil iio iis ika ikb ikc iki ikk ikl iko iks il- ila ilb ilc ili ilk ill ilo ils io- ioa iob ioc ioi iol ioo ios is- isa isb isc isi isk isl iso iss ka- kaa kab kac kai kak kal kao kas kba kbb kbc kbi kbk kbl kbo kbs kca kcb kcc kci kck kcl kcs kia kib kic kii kik kil kio kis kkb kkc kki kkk kkl kks kl- kla klb klc kli klo kls koa kob koc koi kok kol koo kos ksa ksb ksc ksi ksk ksl kso kss la- laa lab lac lai lak lal lao las lba lbb lbc lbi lbk lbl lbo lbs lca lcb lcc lci lck lcl lco lcs lia lib lic lii lik lil lio lis lka lkb lkl lks lla llb llc lli llk lll llo lls loa lob loc loi lok lol loo los lsa lsb lsc lsi lsk lsl lso lss o-i oaa oab oac oai oak oal oao oas ob- oba obb obc obi obk obl obo obs oc- oca ocb occ oci ock ocl oco ocs oia oib oic oii oik oil oio ois oka okb okc oki okk okl oko oks ola olb olc oli olk oll olo ols oo- ooa oob ooc ooi ook ool ooo oos os- osa osb osc osi osk osl oso oss saa sab sac sai sak sal sao sas sba sbb sbc sbi sbk sbl sbo sbs sca scb scc sci sck scl sco scs sia sib sic sii sik sil sio sis sk- ska skb skc ski skk skl sko sks sla slb slc sli slk sll slo sls soa sob soc soi sok sol soo sos ss- ssa ssb ssc ssi ssk ssl sso sss