-er c-- ccc ccd cce cck cco ccr ccu ccv cdc cdd cde cdk cdo cdr cdu cdv ce- cec ced cee cek ceo cer ceu cev ckc ckd cko co- coc cod coe cok coo cor cou cov crc crd cre crk cro crr cru crv cuc cud cue cuk cuo cur cuu cuv cvc cvd cve cvk cvo cvr cvu cvv dcc dcd dce dck dco dcr dcu dcv ddc ddd dde ddk ddo ddr ddu de- dec ded dee dek deo der deu dev dkc dke dkk dko dkr dku doc dod doe dok doo dor dou dov drc drd dre drk dro drr dru drv duc dud due duk duo dur duv dvc dvd dve dvk dvr dvu ec- ecc ecd ece eck eco ecr ecu ecv ed- edc edd ede edk edo edr edu eec eed eee eek eeo eer eev ekc ekd eke eko ekr eku ekv eo- eoc eod eoe eok eoo eor eou erc erd ere erk ero err eru erv eu- euc eud eue eur euv evc evd eve evo evr evv kcc kcd kce kck kcr kcu kdc kde kdk kdo kdr kdu ke- kec ked kee kek keo ker kev kkc kke kkk kkr kku kkv koc kod koe kok koo kor kou krc krd krk kro krr kru krv kuc kud kue kuk kur kuu kvk kvo kvr kvv oc- occ ocd ock oco ocr ocu ocv odc odd ode odo odr odu odv oec oed oee oeo oer okc okd oke okk oko okr oku oo- ooc ood ook ooo oor oov or- orc ord ore ork oro orr oru orv ou- ouc oud oue ouk ouo our ov- ovc ovd ove ovo ovv rcc rcd rce rco rcr rcu rcv rdc rdd rde rdo rdr rdu rdv re- rec red ree rek reo rer reu rev rkc rke rkk rko rku rkv roc rod roe rok roo ror rou rov rrc rrd rrk rrr rru ruc rud rue ruk ruo rur ruu ruv rvc rvd rve rvo rvr rvu rvv ucc ucd uce uck uco ucr ucu ucv udc udd ude udk udo udr udu udv uec ued uee uer ukc uke ukk ukr uku uoc uod uoe uok uoo uor ur- urc urd ure urk uro urr uru uuc uue uur uuu uvc uve uvo uvu uvv v-e vcc vcd vce vco vcr vcu vdc vdd vde vdk vdo vdr vdu vdv vec ved vee vek veo ver veu voc vod voe vok voo vor vou vov vrc vrd vre vrk vrr vru vue vuk vur vuv vvc vvo vvr vvv