-er c-- ccc cce cck ccn cco ccr ccu ce- cec cee cek cen ceo cer ceu ckc cko cn- cnc cne cnn cno cnr cnu co- coc coe cok con coo cor cou crc cre crk crn cro crr cru cuc cue cuk cun cuo cur cuu ec- ecc ece eck ecn eco ecr ecu eec eee eek een eeo eer ekc eke eko ekr eku en- enc ene enk enn eno enr enu eo- eoc eoe eok eon eoo eor eou erc ere erk ern ero err eru eu- euc eue eun eur kcc kce kck kcn kcr kcu ke- kec kee kek ken keo ker kkc kke kkk kkn kkr kku kn- knc kne knk knn kno knr knu koc koe kok kon koo kor kou krc krk krn kro krr kru kuc kue kuk kun kur kuu ncc nce nck ncn nco ncr ncu ne- nec nee nek nen neo ner neu nkc nke nkk nkn nko nkr nku nnc nne nnk nnn nno nnu no- noc noe nok non noo nor nou nrc nre nrk nrn nro nrr nru nuc nue nuk nun nuo nur nuu oc- occ ock ocn oco ocr ocu oec oee oen oeo oer okc oke okk oko okr oku on- onc one onk onn ono onr onu oo- ooc ook oon ooo oor or- orc ore ork orn oro orr oru ou- ouc oue ouk oun ouo our rcc rce rcn rco rcr rcu re- rec ree rek ren reo rer reu rkc rke rkk rko rku rnc rnn rno rnr rnu roc roe rok ron roo ror rou rrc rrk rrn rrr rru ruc rue ruk run ruo rur ruu ucc uce uck ucn uco ucr ucu uec uee uen uer ukc uke ukk ukn ukr uku un- unc une unk unn uno unr unu uoc uoe uok uon uoo uor ur- urc ure urk urn uro urr uru uuc uue uun uur uuu