-er c-- c-j ccc cce ccj cck cco ccp ccr ce- cec cee cej cek ceo cep cer cjc cjk cjp cjr ckc cko co- coc coe coj cok coo cop cor cpc cpe cpj cpk cpo cpp cpr crc cre crj crk cro crp crr ec- ecc ece ecj eck eco ecr eec eee eek eeo eep eer ejc ejo ejp ekc eke eko ekp ekr eo- eoc eoe eok eoo eop eor ep- epc epe epo epp epr erc ere erk ero erp err jcc jce jck jco jcp jcr jec jee jej jek jeo jep jer jjc jjj jjk jjp jjr jkk jko jkp jkr joc joe joj jok joo jop jor jpc jpe jpj jpo jpp jpr jrc jrk jro jrp jrr kcc kce kck kcp kcr ke- kec kee kek keo kep ker kjc kje kjr kkc kke kkk kkp kkr koc koe kok koo kop kor kpc kpe kpk kpo kpp kpr krc krk kro krp krr oc- occ ocj ock oco ocp ocr oec oee oeo oep oer ojc oje ojo okc oke okj okk oko okp okr oo- ooc ook ooo oop oor op- opc ope opj opk opo opp opr or- orc ore ork oro orp orr p-p pcc pce pcj pck pco pcp pcr pec pee pek peo pep per pjc pjo pjp pkc pke pko pkp pkr poc poe pok poo pop por ppc ppe ppj ppk ppo ppp ppr prc pre prk pro prp prr rcc rce rcj rco rcp rcr re- rec ree rek reo rep rer rjc rjk rjp rjr rkc rke rkk rko rkp roc roe roj rok roo rop ror rpc rpe rpk rpo rpp rpr rrc rrk rrp rrr