-er c-- ccc cce cck cco ccp ccr cct ccv ce- cec cee cek ceo cep cer cet cev ckc cko ckt co- coc coe cok coo cop cor cot cov cpc cpe cpk cpo cpp cpr cpt cpv crc cre crk cro crp crr crt crv ctc cte ctk cto ctp ctr ctt ctv cvc cve cvk cvo cvp cvr cvt cvv ec- ecc ece eck eco ecr ect ecv eec eee eek eeo eep eer eet eev ekc eke eko ekp ekr ekt ekv eo- eoc eoe eok eoo eop eor eot ep- epc epe epo epp epr ept erc ere erk ero erp err ert erv etc ete etk eto etp etr ett etv evc eve evo evp evr evt evv k-t kcc kce kck kcp kcr kct ke- kec kee kek keo kep ker ket kev kkc kke kkk kkp kkr kkt kkv koc koe kok koo kop kor kot kpc kpe kpk kpo kpp kpr kpt kpv krc krk kro krp krr krt krv ktc kte ktk kto ktp ktr ktt ktv kvk kvo kvp kvr kvv oc- occ ock oco ocp ocr oct ocv oec oee oeo oep oer oet okc oke okk oko okp okr oo- ooc ook ooo oop oor oot oov op- opc ope opk opo opp opr opt opv or- orc ore ork oro orp orr ort orv ot- otc ote otk oto otp otr ott otv ov- ovc ove ovo ovp ovv p-p pcc pce pck pco pcp pcr pct pcv pec pee pek peo pep per pet pev pkc pke pko pkp pkr pkt poc poe pok poo pop por pot pov ppc ppe ppk ppo ppp ppr ppt ppv prc pre prk pro prp prr prt prv pt- ptc pte ptk pto ptp ptr ptt ptv pvc pve pvk pvo pvp pvr pvt pvv rcc rce rco rcp rcr rct rcv re- rec ree rek reo rep rer ret rev rkc rke rkk rko rkp rkt rkv roc roe rok roo rop ror rot rov rpc rpe rpk rpo rpp rpr rpt rpv rrc rrk rrp rrr rrt rtc rte rtk rto rtp rtr rtt rtv rvc rve rvo rvp rvr rvt rvv tcc tce tck tco tcp tcr tct tcv te- tec tee tek teo tep ter tet tev tkc tke tkk tko tkp tkr tkt to- toc toe tok too top tor tot tov tpc tpe tpk tpo tpp tpr tpt tpv trc tre trk tro trp trr trt trv ttc tte ttk tto ttp ttr ttt ttv tvc tve tvk tvo tvp tvr tvt v-e vcc vce vco vcp vcr vct vec vee vek veo vep ver vet vkp vkt voc voe vok voo vop vor vot vov vpc vpe vpk vpo vpp vpr vpt vrc vre vrk vrp vrr vrt vtc vte vtk vto vtr vtt vtv vvc vvo vvr vvt vvv