-er c-- ccc ccd cce cck ccn cco ccr ccu cdc cdd cde cdk cdn cdo cdr cdu ce- cec ced cee cek cen ceo cer ceu ckc ckd cko cn- cnc cnd cne cnn cno cnr cnu co- coc cod coe cok con coo cor cou crc crd cre crk crn cro crr cru cuc cud cue cuk cun cuo cur cuu dcc dcd dce dck dcn dco dcr dcu ddc ddd dde ddk ddn ddo ddr ddu de- dec ded dee dek den deo der deu dkc dke dkk dko dkr dku dnc dnd dne dnk dnn dno dnr doc dod doe dok don doo dor dou drc drd dre drk drn dro drr dru duc dud due duk dun duo dur ec- ecc ecd ece eck ecn eco ecr ecu ed- edc edd ede edk edn edo edr edu eec eed eee eek een eeo eer ekc ekd eke eko ekr eku en- enc end ene enk enn eno enr enu eo- eoc eod eoe eok eon eoo eor eou erc erd ere erk ern ero err eru eu- euc eud eue eun eur kcc kcd kce kck kcn kcr kcu kdc kde kdk kdo kdr kdu ke- kec ked kee kek ken keo ker kkc kke kkk kkn kkr kku kn- knc knd kne knk knn kno knr knu koc kod koe kok kon koo kor kou krc krd krk krn kro krr kru kuc kud kue kuk kun kur kuu ncc ncd nce nck ncn nco ncr ncu ndc ndd nde ndk ndn ndo ndr ndu ne- nec ned nee nek nen neo ner neu nkc nke nkk nkn nko nkr nku nnc nne nnk nnn nno nnu no- noc nod noe nok non noo nor nou nrc nrd nre nrk nrn nro nrr nru nuc nud nue nuk nun nuo nur nuu oc- occ ocd ock ocn oco ocr ocu odc odd ode odn odo odr odu oec oed oee oen oeo oer okc okd oke okk oko okr oku on- onc ond one onk onn ono onr onu oo- ooc ood ook oon ooo oor or- orc ord ore ork orn oro orr oru ou- ouc oud oue ouk oun ouo our rcc rcd rce rcn rco rcr rcu rdc rdd rde rdn rdo rdr rdu re- rec red ree rek ren reo rer reu rkc rke rkk rko rku rnc rnd rnn rno rnr rnu roc rod roe rok ron roo ror rou rrc rrd rrk rrn rrr rru ruc rud rue ruk run ruo rur ruu ucc ucd uce uck ucn uco ucr ucu udc udd ude udk udn udo udr udu uec ued uee uen uer ukc uke ukk ukn ukr uku un- unc und une unk unn uno unr unu uoc uod uoe uok uon uoo uor ur- urc urd ure urk urn uro urr uru uuc uue uun uur uuu