-er -ic c-- ccc cce cci ccm ccr ccx ce- cec cee cei cem cer cex ci- cic cie cii cim cir cix cmc cme cmi cmm cmr cmx crc cre cri crm crr crx cxc cxi cxr cxx ec- ecc ece eci ecm ecr ecx eec eee eem eer eex eic eie eii eim eir eix em- emc eme emi emm emr emx erc ere eri erm err ex- exc exe exi exr exx icc ice ici icm icr ie- iec iee iei iem ier iex iic iie iii iim iir iix im- imc ime imi imm imx ir- irc ire iri irm irr irx ixc ixe ixi m-r mc- mcc mce mci mcm mcr mcx mec mee mei mem mer mex mi- mic mie mii mim mir mix mmc mme mmi mmm mmr mmx mrc mre mri mrm mrr mrx mxc mxi mxr rcc rce rci rcm rcr rcx re- rec ree rei rem rer rex ric rie rii rim rir rix rmc rme rmi rmm rmr rmx rrc rri rrm rrr rxr xci xcr xcx xee xem xer xex xic xie xii xix xmc xmi xmm xmr xmx xrc xrx xxi xxx