-er c-- ccc ccd cce cck ccp ccr cdc cdd cde cdk cdp cdr ce- cec ced cee cek cep cer ckc ckd cpc cpd cpe cpk cpp cpr crc crd cre crk crp crr dcc dcd dce dck dcp dcr ddc ddd dde ddk ddp ddr de- dec ded dee dek dep der dkc dke dkk dkp dkr dpc dpd dpe dpk dpp dpr drc drd dre drk drp drr ec- ecc ecd ece eck ecr ed- edc edd ede edk edp edr eec eed eee eek eep eer ekc ekd eke ekp ekr ep- epc epd epe epp epr erc erd ere erk erp err kcc kcd kce kck kcp kcr kdc kde kdk kdp kdr ke- kec ked kee kek kep ker kkc kke kkk kkp kkr kpc kpd kpe kpk kpp kpr krc krd krk krp krr p-p pcc pcd pce pck pcp pcr pdc pdd pde pdk pdp pdr pec ped pee pek pep per pkc pkd pke pkp pkr ppc ppd ppe ppk ppp ppr prc prd pre prk prp prr rcc rcd rce rcp rcr rdc rdd rde rdp rdr re- rec red ree rek rep rer rkc rke rkk rkp rpc rpd rpe rpk rpp rpr rrc rrd rrk rrp rrr