-er c-- ccc cce cck ccn cco ccp ccr cct ce- cec cee cek cen ceo cep cer cet ckc cko ckt cn- cnc cne cnn cno cnp cnr cnt co- coc coe cok con coo cop cor cot cpc cpe cpk cpn cpo cpp cpr cpt crc cre crk crn cro crp crr crt ctc cte ctk ctn cto ctp ctr ctt ec- ecc ece eck ecn eco ecr ect eec eee eek een eeo eep eer eet ekc eke eko ekp ekr ekt en- enc ene enk enn eno enp enr ent eo- eoc eoe eok eon eoo eop eor eot ep- epc epe epn epo epp epr ept erc ere erk ern ero erp err ert etc ete etk etn eto etp etr ett k-t kcc kce kck kcn kcp kcr kct ke- kec kee kek ken keo kep ker ket kkc kke kkk kkn kkp kkr kkt kn- knc kne knk knn kno knp knr knt koc koe kok kon koo kop kor kot kpc kpe kpk kpn kpo kpp kpr kpt krc krk krn kro krp krr krt ktc kte ktk ktn kto ktp ktr ktt ncc nce nck ncn nco ncp ncr nct ne- nec nee nek nen neo nep ner net nkc nke nkk nkn nko nkp nkr nkt nnc nne nnk nnn nno nnp nnt no- noc noe nok non noo nop nor not npc npe npn npo npp npr npt nrc nre nrk nrn nro nrp nrr nrt ntc nte ntk ntn nto ntp ntr ntt oc- occ ock ocn oco ocp ocr oct oec oee oen oeo oep oer oet okc oke okk oko okp okr on- onc one onk onn ono onp onr ont oo- ooc ook oon ooo oop oor oot op- opc ope opk opn opo opp opr opt or- orc ore ork orn oro orp orr ort ot- otc ote otk otn oto otp otr ott p-p pcc pce pck pcn pco pcp pcr pct pec pee pek pen peo pep per pet pkc pke pkn pko pkp pkr pkt pn- pnc pne pnk pnn pno pnp pnr pnt poc poe pok pon poo pop por pot ppc ppe ppk ppn ppo ppp ppr ppt prc pre prk prn pro prp prr prt pt- ptc pte ptk ptn pto ptp ptr ptt rcc rce rcn rco rcp rcr rct re- rec ree rek ren reo rep rer ret rkc rke rkk rko rkp rkt rnc rnn rno rnp rnr rnt roc roe rok ron roo rop ror rot rpc rpe rpk rpn rpo rpp rpr rpt rrc rrk rrn rrp rrr rrt rtc rte rtk rtn rto rtp rtr rtt tcc tce tck tcn tco tcp tcr tct te- tec tee tek ten teo tep ter tet tkc tke tkk tko tkp tkr tkt tnc tne tnk tnn tno tnp tnr tnt to- toc toe tok ton too top tor tot tpc tpe tpk tpn tpo tpp tpr tpt trc tre trk trn tro trp trr trt ttc tte ttk ttn tto ttp ttr ttt