-er c-- ccc cce ccf ccn ccr cct ce- cec cee cef cen cer cet cfc cfe cff cfn cfr cft cn- cnc cne cnf cnn cnr cnt crc cre crf crn crr crt ctc cte ctf ctn ctr ctt ec- ecc ece ecf ecn ecr ect eec eee eef een eer eet ef- efc efe eff efr eft en- enc ene enf enn enr ent erc ere erf ern err ert etc ete etf etn etr ett fcc fce fcf fcn fcr fct fec fee fef fen fer fet ffc ffe fff ffn ffr fft fnc fne fnf fnn fnr fnt frc fre frf frn frr frt ftc fte ftf ftn ftr ftt ncc nce ncf ncn ncr nct ne- nec nee nef nen ner net nfc nfe nff nfn nfr nft nnc nne nnf nnn nnt nrc nre nrf nrn nrr nrt ntc nte ntf ntn ntr ntt rcc rce rcf rcn rcr rct re- rec ree ref ren rer ret rfc rfe rff rfn rfr rft rnc rnn rnr rnt rrc rrf rrn rrr rrt rtc rte rtf rtn rtr rtt tcc tce tcf tcn tcr tct te- tec tee tef ten ter tet tfc tfe tff tfn tfr tft tnc tne tnf tnn tnr tnt trc tre trf trn trr trt ttc tte ttf ttn ttr ttt