-er c-- ccc cce ccn cco ccr ccu ce- cec cee cen ceo cer ceu cn- cnc cne cnn cno cnr cnu co- coc coe con coo cor cou crc cre crn cro crr cru cuc cue cun cuo cur cuu ec- ecc ece ecn eco ecr ecu eec eee een eeo eer en- enc ene enn eno enr enu eo- eoc eoe eon eoo eor eou erc ere ern ero err eru eu- euc eue eun eur ncc nce ncn nco ncr ncu ne- nec nee nen neo ner neu nnc nne nnn nno nnu no- noc noe non noo nor nou nrc nre nrn nro nrr nru nuc nue nun nuo nur nuu oc- occ ocn oco ocr ocu oec oee oen oeo oer on- onc one onn ono onr onu oo- ooc oon ooo oor or- orc ore orn oro orr oru ou- ouc oue oun ouo our rcc rce rcn rco rcr rcu re- rec ree ren reo rer reu rnc rnn rno rnr rnu roc roe ron roo ror rou rrc rrn rrr rru ruc rue run ruo rur ruu ucc uce ucn uco ucr ucu uec uee uen uer un- unc une unn uno unr unu uoc uoe uon uoo uor ur- urc ure urn uro urr uru uuc uue uun uur uuu