a-a a-c aaa aac aad aaf aak aan aao aas ac- aca acc acd acf ack acn aco acs ad- ada adc add adf adk adn ado ads af- afa afc afd aff afk afn afo afs aka akc akd akk akn ako aks an- ana anc and anf ank ann ano ans aoa aoc aod aof aok aon aoo aos as- asa asc asd asf ask asn aso ass c-- caa cac cad caf cak can cao cas cca ccc ccd ccf cck ccn cco ccs cda cdc cdd cdf cdk cdn cdo cds cfa cfc cfd cff cfk cfn cfo cfs cka ckc ckd cko cks cn- cna cnc cnd cnf cnn cno cns co- coa coc cod cof cok con coo cos csa csc csd csf csk csn cso css daa dac dad daf dak dan dao das dca dcc dcd dcf dck dcn dco dcs dda ddc ddd ddf ddk ddn ddo dds dfa dfc dfd dff dfk dfn dfo dfs dka dkc dkk dko dks dna dnc dnd dnf dnk dnn dno dns doa doc dod dof dok don doo dos dsa dsc dsd dsf dsk dsn dso dss faa fac fad faf fak fan fao fas fca fcc fcd fcf fck fcn fco fcs fda fdc fdd fdf fdk fdn fdo fds ffa ffc ffd fff ffk ffn ffo ffs fka fkc fkf fkk fna fnc fnd fnf fnk fnn fns foa foc fof fok fon foo fos fsa fsc fsd fsf fsk fsn fso fss ka- kaa kac kad kaf kak kan kao kas kca kcc kcd kck kcn kcs kda kdc kdf kdk kdo kds kfa kfc kfd kff kfo kfs kkc kkk kkn kks kn- kna knc knd knf knk knn kno koa koc kod kof kok kon koo kos ksa ksc ksd ksf ksk ksn kso kss naa nac nad naf nak nan nao nas nca ncc ncd ncf nck ncn nco ncs nda ndc ndd ndf ndk ndn ndo nds nfa nfc nfd nff nfk nfn nfo nfs nka nkc nkf nkk nkn nko nks nna nnc nnf nnk nnn nno nns no- noa noc nod nof nok non noo nos nsa nsc nsd nsf nsk nsn nso nss oaa oac oad oaf oak oan oao oas oc- oca occ ocd ocf ock ocn oco ocs oda odc odd odf odn odo ods of- ofa ofc ofd off ofn ofo ofs oka okc okd okk oko oks on- ona onc ond onf onk onn ono ons oo- ooa ooc ood oof ook oon ooo oos os- osa osc osd osf osk osn oso oss saa sac sad saf sak san sao sas sca scc scd scf sck scn sco scs sda sdc sdd sdf sdk sdn sdo sds sfa sfc sfd sff sfk sfn sfo sfs sk- ska skc skd skf skk sko sks sna snc snd snf snk snn sno sns soa soc sod sof sok son soo sos ss- ssa ssc ssd ssf ssk ssn sso sss