-er -ic c-- ccc cce cci cco ccp ccr ce- cec cee cei ceo cep cer ci- cic cie cii cio cip cir co- coc coe coi coo cop cor cpc cpe cpi cpo cpp cpr crc cre cri cro crp crr ec- ecc ece eci eco ecr eec eee eeo eep eer eic eie eii eio eip eir eo- eoc eoe eoi eoo eop eor ep- epc epe epi epo epp epr erc ere eri ero erp err icc ice ici ico icp icr ie- iec iee iei iep ier iic iie iii iio iip iir io- ioc ioe ioi ioo iop ior ipc ipe ipi ipo ipp ipr ir- irc ire iri iro irp irr o-i oc- occ oci oco ocp ocr oec oee oei oeo oep oer oic oie oii oio oip oir oo- ooc ooi ooo oop oor op- opc ope opi opo opp opr or- orc ore ori oro orp orr p-p pcc pce pci pco pcp pcr pec pee pei peo pep per pic pie pii pio pip pir poc poe poi poo pop por ppc ppe ppi ppo ppp ppr prc pre pri pro prp prr rcc rce rci rco rcp rcr re- rec ree rei reo rep rer ric rie rii rio rip rir roc roe roi roo rop ror rpc rpe rpi rpo rpp rpr rrc rri rrp rrr