-er c-- c-j ccc cce ccj cck ccp ccr ce- cec cee cej cek cep cer cjc cjk cjp cjr ckc cpc cpe cpj cpk cpp cpr crc cre crj crk crp crr ec- ecc ece ecj eck ecr eec eee eek eep eer ejc ejp ekc eke ekp ekr ep- epc epe epp epr erc ere erk erp err jcc jce jck jcp jcr jec jee jej jek jep jer jjc jjj jjk jjp jjr jkk jkp jkr jpc jpe jpj jpp jpr jrc jrk jrp jrr kcc kce kck kcp kcr ke- kec kee kek kep ker kjc kje kjr kkc kke kkk kkp kkr kpc kpe kpk kpp kpr krc krk krp krr p-p pcc pce pcj pck pcp pcr pec pee pek pep per pjc pjp pkc pke pkp pkr ppc ppe ppj ppk ppp ppr prc pre prk prp prr rcc rce rcj rcp rcr re- rec ree rek rep rer rjc rjk rjp rjr rkc rke rkk rkp rpc rpe rpk rpp rpr rrc rrk rrp rrr