-er -ic c-- ccc cce cci ccm ccp ccr ce- cec cee cei cem cep cer ci- cic cie cii cim cip cir cmc cme cmi cmm cmp cmr cpc cpe cpi cpm cpp cpr crc cre cri crm crp crr ec- ecc ece eci ecm ecr eec eee eem eep eer eic eie eii eim eip eir em- emc eme emi emm emp emr ep- epc epe epi epm epp epr erc ere eri erm erp err icc ice ici icm icp icr ie- iec iee iei iem iep ier iic iie iii iim iip iir im- imc ime imi imm imp ipc ipe ipi ipm ipp ipr ir- irc ire iri irm irp irr m-r mc- mcc mce mci mcm mcp mcr mec mee mei mem mep mer mi- mic mie mii mim mip mir mmc mme mmi mmm mmp mmr mpc mpe mpi mpm mpp mpr mrc mre mri mrm mrp mrr p-p pcc pce pci pcm pcp pcr pec pee pei pem pep per pic pie pii pim pip pir pmc pme pmi pmm pmp pmr ppc ppe ppi ppm ppp ppr prc pre pri prm prp prr rcc rce rci rcm rcp rcr re- rec ree rei rem rep rer ric rie rii rim rip rir rmc rme rmi rmm rmp rmr rpc rpe rpi rpm rpp rpr rrc rri rrm rrp rrr