-er c-- ccc cce ccf cck cco ccr cct ccu ce- cec cee cef cek ceo cer cet ceu cfc cfe cff cfk cfo cfr cft cfu ckc cko ckt co- coc coe cof cok coo cor cot cou crc cre crf crk cro crr crt cru ctc cte ctf ctk cto ctr ctt ctu cuc cue cuf cuk cuo cur cut cuu ec- ecc ece ecf eck eco ecr ect ecu eec eee eef eek eeo eer eet ef- efc efe eff efo efr eft ekc eke ekf eko ekr ekt eku eo- eoc eoe eof eok eoo eor eot eou erc ere erf erk ero err ert eru etc ete etf etk eto etr ett etu eu- euc eue euf eur eut fcc fce fcf fck fco fcr fct fcu fec fee fef fek feo fer fet feu ffc ffe fff ffk ffo ffr fft ffu fkc fkf fkk fkt foc foe fof fok foo for fot fou frc fre frf frk fro frr frt fru ftc fte ftf ftk fto ftr ftt ftu fue fuf fuk fuo fur fut fuu k-t kcc kce kck kcr kct kcu ke- kec kee kef kek keo ker ket kfc kff kfo kfu kkc kke kkk kkr kkt kku koc koe kof kok koo kor kot kou krc krf krk kro krr krt kru ktc kte ktf ktk kto ktr ktt ktu kuc kue kuk kur kut kuu oc- occ ocf ock oco ocr oct ocu oec oee oef oeo oer oet of- ofc ofe off ofo ofr oft ofu okc oke okk oko okr oku oo- ooc oof ook ooo oor oot or- orc ore orf ork oro orr ort oru ot- otc ote otf otk oto otr ott otu ou- ouc oue ouf ouk ouo our out rcc rce rcf rco rcr rct rcu re- rec ree ref rek reo rer ret reu rfc rfe rff rfk rfo rfr rft rfu rkc rke rkf rkk rko rkt rku roc roe rof rok roo ror rot rou rrc rrf rrk rrr rrt rru rtc rte rtf rtk rto rtr rtt rtu ruc rue ruf ruk ruo rur rut ruu tcc tce tcf tck tco tcr tct tcu te- tec tee tef tek teo ter tet teu tfc tfe tff tfk tfo tfr tft tfu tkc tke tkk tko tkr tkt to- toc toe tof tok too tor tot tou trc tre trf trk tro trr trt tru ttc tte ttf ttk tto ttr ttt ttu tuc tue tuf tuk tuo tur tut tuu ucc uce ucf uck uco ucr uct ucu uec uee uef uer uet ufc ufe uff ufo ufr uft ufu ukc uke ukf ukk ukr uku uoc uoe uok uoo uor uot ur- urc ure urf urk uro urr urt uru utc ute utf utk uto utr utt utu uuc uue uur uut uuu