-er -ic c-- ccc cce cci cco ccr ce- cec cee cei ceo cer ci- cic cie cii cio cir co- coc coe coi coo cor crc cre cri cro crr ec- ecc ece eci eco ecr eec eee eeo eer eic eie eii eio eir eo- eoc eoe eoi eoo eor erc ere eri ero err icc ice ici ico icr ie- iec iee iei ier iic iie iii iio iir io- ioc ioe ioi ioo ior ir- irc ire iri iro irr o-i oc- occ oci oco ocr oec oee oei oeo oer oic oie oii oio oir oo- ooc ooi ooo oor or- orc ore ori oro orr rcc rce rci rco rcr re- rec ree rei reo rer ric rie rii rio rir roc roe roi roo ror rrc rri rrr