-er -ic c-- ccc cce cci cck cco ccp ccr cct ce- cec cee cei cek ceo cep cer cet ci- cic cie cii cik cio cip cir cit ckc cki cko ckt co- coc coe coi cok coo cop cor cot cpc cpe cpi cpk cpo cpp cpr cpt crc cre cri crk cro crp crr crt ctc cte cti ctk cto ctp ctr ctt ec- ecc ece eci eck eco ecr ect eec eee eek eeo eep eer eet eic eie eii eik eio eip eir eit ekc eke eki eko ekp ekr ekt eo- eoc eoe eoi eok eoo eop eor eot ep- epc epe epi epo epp epr ept erc ere eri erk ero erp err ert etc ete eti etk eto etp etr ett icc ice ici ick ico icp icr ict ie- iec iee iei iek iep ier iet iic iie iii iio iip iir iit ikc ike iki ikk iko ikr ikt io- ioc ioe ioi ioo iop ior iot ipc ipe ipi ipo ipp ipr ipt ir- irc ire iri irk iro irp irr irt itc ite iti itk ito itp itt k-t kcc kce kci kck kcp kcr kct ke- kec kee kei kek keo kep ker ket kic kie kii kik kio kip kir kit kkc kke kki kkk kkp kkr kkt koc koe koi kok koo kop kor kot kpc kpe kpi kpk kpo kpp kpr kpt krc kri krk kro krp krr krt ktc kte ktk kto ktp ktr ktt o-i oc- occ oci ock oco ocp ocr oct oec oee oei oeo oep oer oet oic oie oii oik oio oip oir oit okc oke oki okk oko okp okr oo- ooc ooi ook ooo oop oor oot op- opc ope opi opk opo opp opr opt or- orc ore ori ork oro orp orr ort ot- otc ote oti otk oto otp otr ott p-p pcc pce pci pck pco pcp pcr pct pec pee pei pek peo pep per pet pic pie pii pik pio pip pir pit pkc pke pki pko pkp pkr pkt poc poe poi pok poo pop por pot ppc ppe ppi ppk ppo ppp ppr ppt prc pre pri prk pro prp prr prt pt- ptc pte pti ptk pto ptp ptr ptt rcc rce rci rco rcp rcr rct re- rec ree rei rek reo rep rer ret ric rie rii rik rio rip rir rit rkc rke rkk rko rkp rkt roc roe roi rok roo rop ror rot rpc rpe rpi rpk rpo rpp rpr rpt rrc rri rrk rrp rrr rrt rtc rte rti rtk rto rtp rtr rtt tcc tce tci tck tco tcp tcr tct te- tec tee tei tek teo tep ter tet tic tie tii tik tio tip tir tit tkc tke tkk tko tkp tkr tkt to- toc toe toi tok too top tor tot tpc tpe tpi tpk tpo tpp tpr tpt trc tre tri trk tro trp trr trt ttc tte tti ttk tto ttp ttr ttt