-er -ol c-- ccc ccd cce cck ccl cco ccr ccu cdc cdd cde cdk cdl cdo cdr cdu ce- cec ced cee cek cel ceo cer ceu ckc ckd cko cl- clc cld cle clk cll clo clr clu co- coc cod coe cok col coo cor cou crc crd cre crk crl cro crr cru cuc cud cue cuk cul cuo cur cuu dcc dcd dce dck dcl dco dcr dcu ddc ddd dde ddk ddl ddo ddr ddu de- dec ded dee dek del deo der deu dkc dke dkk dkl dko dkr dku dl- dlc dld dle dlk dll dlo dlr dlu doc dod doe dok dol doo dor dou drc drd dre drk drl dro drr dru duc dud due duk dul duo dur ec- ecc ecd ece eck ecl eco ecr ecu ed- edc edd ede edk edl edo edr edu eec eed eee eek eel eeo eer ekc ekd eke ekl eko ekr eku elc eld ele elk ell elo elr elu eo- eoc eod eoe eok eol eoo eor eou erc erd ere erk erl ero err eru eu- euc eud eue eul eur kcc kcd kce kck kcl kcr kcu kdc kde kdk kdl kdo kdr kdu ke- kec ked kee kek kel keo ker kkc kke kkk kkl kkr kku kl- klc kld klo klr klu koc kod koe kok kol koo kor kou krc krd krk krl kro krr kru kuc kud kue kuk kul kur kuu lcc lcd lce lck lcl lco lcr lcu ldc ldd lde ldk ldl ldo ldr ldu lec led lee lek lel leo ler leu lkl lkr llc lld lle llk lll llo llr llu loc lod loe lok lol loo lor lou lrc lrd lrk lro lrr lru luc lud lue luk lul luo lur luu oc- occ ocd ock ocl oco ocr ocu odc odd ode odl odo odr odu oec oed oee oel oeo oer okc okd oke okk okl oko okr oku olc old ole olk oll olo olu oo- ooc ood ook ool ooo oor or- orc ord ore ork orl oro orr oru ou- ouc oud oue ouk oul ouo our rcc rcd rce rcl rco rcr rcu rdc rdd rde rdl rdo rdr rdu re- rec red ree rek rel reo rer reu rkc rke rkk rko rku rlc rld rle rll rlo rlr rlu roc rod roe rok rol roo ror rou rrc rrd rrk rrl rrr rru ruc rud rue ruk ruo rur ruu ucc ucd uce uck ucl uco ucr ucu udc udd ude udk udl udo udr udu uec ued uee uel uer ukc uke ukk ukl ukr uku ulc uld ule ulk ull ulo ulr ulu uoc uod uoe uok uol uoo uor ur- urc urd ure urk url uro urr uru uuc uue uur uuu