-er -ic c-- ccc cce cci ccm cco ccr ccs ccx ce- cec cee cei cem ceo cer ces cex ci- cic cie cii cim cio cir cis cix cmc cme cmi cmm cmo cmr cms cmx co- coc coe coi com coo cor cos cox crc cre cri crm cro crr crs crx csc cse csi csm cso csr css csx cxc cxi cxo cxr cxs cxx ec- ecc ece eci ecm eco ecr ecs ecx eec eee eem eeo eer ees eex eic eie eii eim eio eir eis eix em- emc eme emi emm emo emr ems emx eo- eoc eoe eoi eom eoo eor eos erc ere eri erm ero err ers es- esc ese esi esm eso esr ess esx ex- exc exe exi exo exr exs exx icc ice ici icm ico icr ics ie- iec iee iei iem ier ies iex iic iie iii iim iio iir iis iix im- imc ime imi imm imo ims imx io- ioc ioe ioi iom ioo ior ios ir- irc ire iri irm iro irr irs irx is- isc ise isi ism iso isr iss ixc ixe ixi m-o m-r mc- mcc mce mci mcm mco mcr mcs mcx mec mee mei mem meo mer mes mex mi- mic mie mii mim mio mir mis mix mmc mme mmi mmm mmo mmr mms mmx moc moe moi mom moo mor mos mox mrc mre mri mrm mro mrr mrs mrx msc mse msi msm mso msr mss msx mxc mxi mxr mxs o-i oc- occ oci ocm oco ocr ocs ocx oec oee oei oem oeo oer oes oex oic oie oii oim oio oir ois om- omc ome omi omm omo omr oms omx oo- ooc ooi oom ooo oor oos oox or- orc ore ori orm oro orr ors orx os- osc ose osi osm oso osr oss osx ox- oxc oxi oxo oxx rcc rce rci rcm rco rcr rcs rcx re- rec ree rei rem reo rer res rex ric rie rii rim rio rir ris rix rmc rme rmi rmm rmo rmr rms rmx roc roe roi rom roo ror ros rox rrc rri rrm rrr rrs rsc rse rsi rsm rso rsr rss rsx rxr rxs scc sce sci scm sco scr scs scx se- sec see sei sem seo ser ses sex sic sie sii sim sio sir sis six smc sme smi smm smo smr sms smx soc soe soi som soo sor sos sox sr- src sre sri srm sro srr srs srx ss- ssc sse ssi ssm sso ssr sss ssx sxc sxi sxm sxs xci xcr xcx xee xem xer xes xex xic xie xii xio xis xix xmc xmi xmm xmo xmr xms xmx xoc xoi xom xoo xor xos xox xrc xrx xsc xsi xsm xss xxi xxo xxx