-er c-- ccc ccd cce cck cco ccp ccr cct cdc cdd cde cdk cdo cdp cdr cdt ce- cec ced cee cek ceo cep cer cet ckc ckd cko ckt co- coc cod coe cok coo cop cor cot cpc cpd cpe cpk cpo cpp cpr cpt crc crd cre crk cro crp crr crt ctc ctd cte ctk cto ctp ctr ctt dcc dcd dce dck dco dcp dcr dct ddc ddd dde ddk ddo ddp ddr ddt de- dec ded dee dek deo dep der det dkc dke dkk dko dkp dkr dkt doc dod doe dok doo dop dor dot dpc dpd dpe dpk dpo dpp dpr dpt drc drd dre drk dro drp drr drt dtc dtd dte dtk dto dtp dtr dtt ec- ecc ecd ece eck eco ecr ect ed- edc edd ede edk edo edp edr edt eec eed eee eek eeo eep eer eet ekc ekd eke eko ekp ekr ekt eo- eoc eod eoe eok eoo eop eor eot ep- epc epd epe epo epp epr ept erc erd ere erk ero erp err ert etc etd ete etk eto etp etr ett k-t kcc kcd kce kck kcp kcr kct kdc kde kdk kdo kdp kdr kdt ke- kec ked kee kek keo kep ker ket kkc kke kkk kkp kkr kkt koc kod koe kok koo kop kor kot kpc kpd kpe kpk kpo kpp kpr kpt krc krd krk kro krp krr krt ktc kte ktk kto ktp ktr ktt oc- occ ocd ock oco ocp ocr oct odc odd ode odo odp odr odt oec oed oee oeo oep oer oet okc okd oke okk oko okp okr oo- ooc ood ook ooo oop oor oot op- opc opd ope opk opo opp opr opt or- orc ord ore ork oro orp orr ort ot- otc otd ote otk oto otp otr ott p-p pcc pcd pce pck pco pcp pcr pct pdc pdd pde pdk pdo pdp pdr pdt pec ped pee pek peo pep per pet pkc pkd pke pko pkp pkr pkt poc pod poe pok poo pop por pot ppc ppd ppe ppk ppo ppp ppr ppt prc prd pre prk pro prp prr prt pt- ptc ptd pte ptk pto ptp ptr ptt rcc rcd rce rco rcp rcr rct rdc rdd rde rdo rdp rdr rdt re- rec red ree rek reo rep rer ret rkc rke rkk rko rkp rkt roc rod roe rok roo rop ror rot rpc rpd rpe rpk rpo rpp rpr rpt rrc rrd rrk rrp rrr rrt rtc rtd rte rtk rto rtp rtr rtt tcc tcd tce tck tco tcp tcr tct tdc tdd tde tdk tdo tdp tdr tdt te- tec ted tee tek teo tep ter tet tkc tke tkk tko tkp tkr tkt to- toc tod toe tok too top tor tot tpc tpd tpe tpk tpo tpp tpr tpt trc trd tre trk tro trp trr trt ttc ttd tte ttk tto ttp ttr ttt