-er a-a a-c aaa aac aad aae aap aar aas ac- aca acc acd ace acp acr acs ad- ada adc add ade adp adr ads aea aec aed aee aep aer aes ap- apa apc apd ape app apr aps ar- ara arc ard are arp arr ars as- asa asc asd ase asp asr ass c-- caa cac cad cae cap car cas cca ccc ccd cce ccp ccr ccs cda cdc cdd cde cdp cdr cds ce- cea cec ced cee cep cer ces cpa cpc cpd cpe cpp cpr cps cra crc crd cre crp crr crs csa csc csd cse csp csr css daa dac dad dae dap dar das dca dcc dcd dce dcp dcr dcs dda ddc ddd dde ddp ddr dds de- dea dec ded dee dep der des dpa dpc dpd dpe dpp dpr dps dra drc drd dre drp drr drs dsa dsc dsd dse dsp dsr dss eaa eac ead eae eap ear eas ec- eca ecc ecd ece ecr ecs ed- eda edc edd ede edp edr eds eea eec eed eee eep eer ees ep- epa epc epd epe epp epr eps era erc erd ere erp err ers es- esa esc esd ese esp esr ess p-p paa pac pad pae pap par pas pca pcc pcd pce pcp pcr pcs pda pdc pdd pde pdp pdr pds pea pec ped pee pep per pes ppa ppc ppd ppe ppp ppr pps pra prc prd pre prp prr prs ps- psa psc psd pse psp psr pss ra- raa rac rad rae rap rar ras rca rcc rcd rce rcp rcr rcs rda rdc rdd rde rdp rdr rds re- rea rec red ree rep rer res rpa rpc rpd rpe rpp rpr rps rra rrc rrd rrp rrr rrs rsa rsc rsd rse rsp rsr rss saa sac sad sae sap sar sas sca scc scd sce scp scr scs sda sdc sdd sde sdp sdr sds se- sea sec sed see sep ser ses spa spc spd spe spp spr sps sr- sra src srd sre srp srr srs ss- ssa ssc ssd sse ssp ssr sss