-er a-a a-c aaa aac aad aae aak aar aas ac- aca acc acd ace ack acr acs ad- ada adc add ade adk adr ads aea aec aed aee aek aer aes aka akc akd ake akk akr aks ar- ara arc ard are ark arr ars as- asa asc asd ase ask asr ass c-- caa cac cad cae cak car cas cca ccc ccd cce cck ccr ccs cda cdc cdd cde cdk cdr cds ce- cea cec ced cee cek cer ces cka ckc ckd cks cra crc crd cre crk crr crs csa csc csd cse csk csr css daa dac dad dae dak dar das dca dcc dcd dce dck dcr dcs dda ddc ddd dde ddk ddr dds de- dea dec ded dee dek der des dka dkc dke dkk dkr dks dra drc drd dre drk drr drs dsa dsc dsd dse dsk dsr dss eaa eac ead eae eak ear eas ec- eca ecc ecd ece eck ecr ecs ed- eda edc edd ede edk edr eds eea eec eed eee eek eer ees eka ekc ekd eke ekr eks era erc erd ere erk err ers es- esa esc esd ese esk esr ess ka- kaa kac kad kae kak kar kas kca kcc kcd kce kck kcr kcs kda kdc kde kdk kdr kds ke- kea kec ked kee kek ker kes kkc kke kkk kkr kks kra krc krd krk krr krs ksa ksc ksd kse ksk ksr kss ra- raa rac rad rae rak rar ras rca rcc rcd rce rcr rcs rda rdc rdd rde rdr rds re- rea rec red ree rek rer res rkc rke rkk rks rra rrc rrd rrk rrr rrs rsa rsc rsd rse rsk rsr rss saa sac sad sae sak sar sas sca scc scd sce sck scr scs sda sdc sdd sde sdk sdr sds se- sea sec sed see sek ser ses sk- ska skc skd ske skk skr sks sr- sra src srd sre srk srr srs ss- ssa ssc ssd sse ssk ssr sss