-er c-- ccc cce cck ccn cco ccp ccr ce- cec cee cek cen ceo cep cer ckc cko cn- cnc cne cnn cno cnp cnr co- coc coe cok con coo cop cor cpc cpe cpk cpn cpo cpp cpr crc cre crk crn cro crp crr ec- ecc ece eck ecn eco ecr eec eee eek een eeo eep eer ekc eke eko ekp ekr en- enc ene enk enn eno enp enr eo- eoc eoe eok eon eoo eop eor ep- epc epe epn epo epp epr erc ere erk ern ero erp err kcc kce kck kcn kcp kcr ke- kec kee kek ken keo kep ker kkc kke kkk kkn kkp kkr kn- knc kne knk knn kno knp knr koc koe kok kon koo kop kor kpc kpe kpk kpn kpo kpp kpr krc krk krn kro krp krr ncc nce nck ncn nco ncp ncr ne- nec nee nek nen neo nep ner nkc nke nkk nkn nko nkp nkr nnc nne nnk nnn nno nnp no- noc noe nok non noo nop nor npc npe npn npo npp npr nrc nre nrk nrn nro nrp nrr oc- occ ock ocn oco ocp ocr oec oee oen oeo oep oer okc oke okk oko okp okr on- onc one onk onn ono onp onr oo- ooc ook oon ooo oop oor op- opc ope opk opn opo opp opr or- orc ore ork orn oro orp orr p-p pcc pce pck pcn pco pcp pcr pec pee pek pen peo pep per pkc pke pkn pko pkp pkr pn- pnc pne pnk pnn pno pnp pnr poc poe pok pon poo pop por ppc ppe ppk ppn ppo ppp ppr prc pre prk prn pro prp prr rcc rce rcn rco rcp rcr re- rec ree rek ren reo rep rer rkc rke rkk rko rkp rnc rnn rno rnp rnr roc roe rok ron roo rop ror rpc rpe rpk rpn rpo rpp rpr rrc rrk rrn rrp rrr