-er c-- ccc ccd cce cck cco ccr cct ccu cdc cdd cde cdk cdo cdr cdt cdu ce- cec ced cee cek ceo cer cet ceu ckc ckd cko ckt co- coc cod coe cok coo cor cot cou crc crd cre crk cro crr crt cru ctc ctd cte ctk cto ctr ctt ctu cuc cud cue cuk cuo cur cut cuu dcc dcd dce dck dco dcr dct dcu ddc ddd dde ddk ddo ddr ddt ddu de- dec ded dee dek deo der det deu dkc dke dkk dko dkr dkt dku doc dod doe dok doo dor dot dou drc drd dre drk dro drr drt dru dtc dtd dte dtk dto dtr dtt dtu duc dud due duk duo dur dut ec- ecc ecd ece eck eco ecr ect ecu ed- edc edd ede edk edo edr edt edu eec eed eee eek eeo eer eet ekc ekd eke eko ekr ekt eku eo- eoc eod eoe eok eoo eor eot eou erc erd ere erk ero err ert eru etc etd ete etk eto etr ett etu eu- euc eud eue eur eut k-t kcc kcd kce kck kcr kct kcu kdc kde kdk kdo kdr kdt kdu ke- kec ked kee kek keo ker ket kkc kke kkk kkr kkt kku koc kod koe kok koo kor kot kou krc krd krk kro krr krt kru ktc kte ktk kto ktr ktt ktu kuc kud kue kuk kur kut kuu oc- occ ocd ock oco ocr oct ocu odc odd ode odo odr odt odu oec oed oee oeo oer oet okc okd oke okk oko okr oku oo- ooc ood ook ooo oor oot or- orc ord ore ork oro orr ort oru ot- otc otd ote otk oto otr ott otu ou- ouc oud oue ouk ouo our out rcc rcd rce rco rcr rct rcu rdc rdd rde rdo rdr rdt rdu re- rec red ree rek reo rer ret reu rkc rke rkk rko rkt rku roc rod roe rok roo ror rot rou rrc rrd rrk rrr rrt rru rtc rtd rte rtk rto rtr rtt rtu ruc rud rue ruk ruo rur rut ruu tcc tcd tce tck tco tcr tct tcu tdc tdd tde tdk tdo tdr tdt tdu te- tec ted tee tek teo ter tet teu tkc tke tkk tko tkr tkt to- toc tod toe tok too tor tot tou trc trd tre trk tro trr trt tru ttc ttd tte ttk tto ttr ttt ttu tuc tud tue tuk tuo tur tut tuu ucc ucd uce uck uco ucr uct ucu udc udd ude udk udo udr udt udu uec ued uee uer uet ukc uke ukk ukr uku uoc uod uoe uok uoo uor uot ur- urc urd ure urk uro urr urt uru utc utd ute utk uto utr utt utu uuc uue uur uut uuu