-er c-- ccc ccd cce ccn ccp ccr cdc cdd cde cdn cdp cdr ce- cec ced cee cen cep cer cn- cnc cnd cne cnn cnp cnr cpc cpd cpe cpn cpp cpr crc crd cre crn crp crr dcc dcd dce dcn dcp dcr ddc ddd dde ddn ddp ddr de- dec ded dee den dep der dnc dnd dne dnn dnp dnr dpc dpd dpe dpn dpp dpr drc drd dre drn drp drr ec- ecc ecd ece ecn ecr ed- edc edd ede edn edp edr eec eed eee een eep eer en- enc end ene enn enp enr ep- epc epd epe epn epp epr erc erd ere ern erp err ncc ncd nce ncn ncp ncr ndc ndd nde ndn ndp ndr ne- nec ned nee nen nep ner nnc nne nnn nnp npc npd npe npn npp npr nrc nrd nre nrn nrp nrr p-p pcc pcd pce pcn pcp pcr pdc pdd pde pdn pdp pdr pec ped pee pen pep per pn- pnc pnd pne pnn pnp pnr ppc ppd ppe ppn ppp ppr prc prd pre prn prp prr rcc rcd rce rcn rcp rcr rdc rdd rde rdn rdp rdr re- rec red ree ren rep rer rnc rnd rnn rnp rnr rpc rpd rpe rpn rpp rpr rrc rrd rrn rrp rrr