a-a a-c a-z aaa aac aad aak aao aar aas aaz ac- aca acc acd ack aco acr acs acz ad- ada adc add adk ado adr ads adz aka akc akd akk ako akr aks aoa aoc aod aok aoo aor aos ar- ara arc ard ark aro arr ars arz as- asa asc asd ask aso asr ass asz az- aza azd azo azs azz c-- caa cac cad cak cao car cas caz cca ccc ccd cck cco ccr ccs ccz cda cdc cdd cdk cdo cdr cds cdz cka ckc ckd cko cks co- coa coc cod cok coo cor cos coz cra crc crd crk cro crr crs crz csa csc csd csk cso csr css csz cz- czc czd czk czo daa dac dad dak dao dar das daz dca dcc dcd dck dco dcr dcs dda ddc ddd ddk ddo ddr dds ddz dka dkc dkk dko dkr dks doa doc dod dok doo dor dos doz dra drc drd drk dro drr drs drz dsa dsc dsd dsk dso dsr dss dsz dza dzd dzo dzr dzs k-z ka- kaa kac kad kak kao kar kas kaz kca kcc kcd kck kcr kcs kda kdc kdk kdo kdr kds kkc kkk kkr kks koa koc kod kok koo kor kos koz kra krc krd krk kro krr krs ksa ksc ksd ksk kso ksr kss kzo oaa oac oad oak oao oar oas oc- oca occ ocd ock oco ocr ocs ocz oda odc odd odo odr ods oka okc okd okk oko okr oks oo- ooa ooc ood ook ooo oor oos or- ora orc ord ork oro orr ors orz os- osa osc osd osk oso osr oss oza ozo ozs ozz ra- raa rac rad rak rao rar ras raz rca rcc rcd rco rcr rcs rda rdc rdd rdo rdr rds rkc rkk rko rks rkz roa roc rod rok roo ror ros roz rra rrc rrd rrk rrr rrs rsa rsc rsd rsk rso rsr rss rza rzo saa sac sad sak sao sar sas saz sca scc scd sck sco scr scs sda sdc sdd sdk sdo sdr sds sdz sk- ska skc skd skk sko skr sks soa soc sod sok soo sor sos soz sr- sra src srd srk sro srr srs ss- ssa ssc ssd ssk sso ssr sss ssz sza szd szr zaa zac zad zak zao zar zas zaz zco zcs zds zka zks zo- zoa zoc zod zok zoo zor zos zro zrs zsa zsz zzr zzs zzz