-er a-a a-c aaa aac aad aae aan aap aar aas ac- aca acc acd ace acn acp acr acs ad- ada adc add ade adn adp adr ads aea aec aed aee aen aep aer aes an- ana anc and ane ann anp anr ans ap- apa apc apd ape apn app apr aps ar- ara arc ard are arn arp arr ars as- asa asc asd ase asn asp asr ass c-- caa cac cad cae can cap car cas cca ccc ccd cce ccn ccp ccr ccs cda cdc cdd cde cdn cdp cdr cds ce- cea cec ced cee cen cep cer ces cn- cna cnc cnd cne cnn cnp cnr cns cpa cpc cpd cpe cpn cpp cpr cps cra crc crd cre crn crp crr crs csa csc csd cse csn csp csr css daa dac dad dae dan dap dar das dca dcc dcd dce dcn dcp dcr dcs dda ddc ddd dde ddn ddp ddr dds de- dea dec ded dee den dep der des dna dnc dnd dne dnn dnp dnr dns dpa dpc dpd dpe dpn dpp dpr dps dra drc drd dre drn drp drr drs dsa dsc dsd dse dsn dsp dsr dss eaa eac ead eae ean eap ear eas ec- eca ecc ecd ece ecn ecr ecs ed- eda edc edd ede edn edp edr eds eea eec eed eee een eep eer ees en- ena enc end ene enn enp enr ens ep- epa epc epd epe epn epp epr eps era erc erd ere ern erp err ers es- esa esc esd ese esn esp esr ess naa nac nad nae nan nap nar nas nca ncc ncd nce ncn ncp ncr ncs nda ndc ndd nde ndn ndp ndr nds ne- nea nec ned nee nen nep ner nes nna nnc nne nnn nnp nns npa npc npd npe npn npp npr nps nra nrc nrd nre nrn nrp nrr nrs nsa nsc nsd nse nsn nsp nsr nss p-p paa pac pad pae pan pap par pas pca pcc pcd pce pcn pcp pcr pcs pda pdc pdd pde pdn pdp pdr pds pea pec ped pee pen pep per pes pn- pna pnc pnd pne pnn pnp pnr pns ppa ppc ppd ppe ppn ppp ppr pps pra prc prd pre prn prp prr prs ps- psa psc psd pse psn psp psr pss ra- raa rac rad rae ran rap rar ras rca rcc rcd rce rcn rcp rcr rcs rda rdc rdd rde rdn rdp rdr rds re- rea rec red ree ren rep rer res rna rnc rnd rnn rnp rnr rns rpa rpc rpd rpe rpn rpp rpr rps rra rrc rrd rrn rrp rrr rrs rsa rsc rsd rse rsn rsp rsr rss saa sac sad sae san sap sar sas sca scc scd sce scn scp scr scs sda sdc sdd sde sdn sdp sdr sds se- sea sec sed see sen sep ser ses sna snc snd sne snn snp snr sns spa spc spd spe spn spp spr sps sr- sra src srd sre srn srp srr srs ss- ssa ssc ssd sse ssn ssp ssr sss