-er -ic c-- ccc cce ccf cci cco ccr ce- cec cee cef cei ceo cer cfc cfe cff cfi cfo cfr ci- cic cie cif cii cio cir co- coc coe cof coi coo cor crc cre crf cri cro crr ec- ecc ece ecf eci eco ecr eec eee eef eeo eer ef- efc efe eff efi efo efr eic eie eif eii eio eir eo- eoc eoe eof eoi eoo eor erc ere erf eri ero err fcc fce fcf fci fco fcr fec fee fef fei feo fer ffc ffe fff ffi ffo ffr fic fie fif fii fir foc foe fof foi foo for frc fre frf fri fro frr i-f icc ice icf ici ico icr ie- iec iee ief iei ier ifc ife iff ifi ifo ifr iic iie iif iii iio iir io- ioc ioe iof ioi ioo ior ir- irc ire irf iri iro irr o-i oc- occ ocf oci oco ocr oec oee oef oei oeo oer of- ofc ofe off ofi ofo ofr oic oie oif oii oio oir oo- ooc oof ooi ooo oor or- orc ore orf ori oro orr rcc rce rcf rci rco rcr re- rec ree ref rei reo rer rfc rfe rff rfi rfo rfr ric rie rif rii rio rir roc roe rof roi roo ror rrc rrf rri rrr