-er a-a a-c aaa aac aad aae aan aap aar ac- aca acc acd ace acn acp acr ad- ada adc add ade adn adp adr aea aec aed aee aen aep aer an- ana anc and ane ann anp anr ap- apa apc apd ape apn app apr ar- ara arc ard are arn arp arr c-- caa cac cad cae can cap car cca ccc ccd cce ccn ccp ccr cda cdc cdd cde cdn cdp cdr ce- cea cec ced cee cen cep cer cn- cna cnc cnd cne cnn cnp cnr cpa cpc cpd cpe cpn cpp cpr cra crc crd cre crn crp crr daa dac dad dae dan dap dar dca dcc dcd dce dcn dcp dcr dda ddc ddd dde ddn ddp ddr de- dea dec ded dee den dep der dna dnc dnd dne dnn dnp dnr dpa dpc dpd dpe dpn dpp dpr dra drc drd dre drn drp drr eaa eac ead eae ean eap ear ec- eca ecc ecd ece ecn ecr ed- eda edc edd ede edn edp edr eea eec eed eee een eep eer en- ena enc end ene enn enp enr ep- epa epc epd epe epn epp epr era erc erd ere ern erp err naa nac nad nae nan nap nar nca ncc ncd nce ncn ncp ncr nda ndc ndd nde ndn ndp ndr ne- nea nec ned nee nen nep ner nna nnc nne nnn nnp npa npc npd npe npn npp npr nra nrc nrd nre nrn nrp nrr p-p paa pac pad pae pan pap par pca pcc pcd pce pcn pcp pcr pda pdc pdd pde pdn pdp pdr pea pec ped pee pen pep per pn- pna pnc pnd pne pnn pnp pnr ppa ppc ppd ppe ppn ppp ppr pra prc prd pre prn prp prr ra- raa rac rad rae ran rap rar rca rcc rcd rce rcn rcp rcr rda rdc rdd rde rdn rdp rdr re- rea rec red ree ren rep rer rna rnc rnd rnn rnp rnr rpa rpc rpd rpe rpn rpp rpr rra rrc rrd rrn rrp rrr