-er -ic c-- ccc cce cci ccm cco ccp ccr ccx ce- cec cee cei cem ceo cep cer cex ci- cic cie cii cim cio cip cir cix cmc cme cmi cmm cmo cmp cmr cmx co- coc coe coi com coo cop cor cox cpc cpe cpi cpm cpo cpp cpr cpx crc cre cri crm cro crp crr crx cxc cxi cxo cxp cxr cxx ec- ecc ece eci ecm eco ecr ecx eec eee eem eeo eep eer eex eic eie eii eim eio eip eir eix em- emc eme emi emm emo emp emr emx eo- eoc eoe eoi eom eoo eop eor ep- epc epe epi epm epo epp epr epx erc ere eri erm ero erp err ex- exc exe exi exo exp exr exx icc ice ici icm ico icp icr ie- iec iee iei iem iep ier iex iic iie iii iim iio iip iir iix im- imc ime imi imm imo imp imx io- ioc ioe ioi iom ioo iop ior ipc ipe ipi ipm ipo ipp ipr ipx ir- irc ire iri irm iro irp irr irx ixc ixe ixi m-o m-r mc- mcc mce mci mcm mco mcp mcr mcx mec mee mei mem meo mep mer mex mi- mic mie mii mim mio mip mir mix mmc mme mmi mmm mmo mmp mmr mmx moc moe moi mom moo mop mor mox mpc mpe mpi mpm mpo mpp mpr mpx mrc mre mri mrm mro mrp mrr mrx mxc mxi mxp mxr o-i oc- occ oci ocm oco ocp ocr ocx oec oee oei oem oeo oep oer oex oic oie oii oim oio oip oir om- omc ome omi omm omo omp omr omx oo- ooc ooi oom ooo oop oor oox op- opc ope opi opm opo opp opr opx or- orc ore ori orm oro orp orr orx ox- oxc oxi oxo oxx p-p pcc pce pci pcm pco pcp pcr pcx pec pee pei pem peo pep per pex pic pie pii pim pio pip pir pix pmc pme pmi pmm pmo pmp pmr pmx poc poe poi pom poo pop por pox ppc ppe ppi ppm ppo ppp ppr ppx prc pre pri prm pro prp prr prx pxc pxe pxm pxr rcc rce rci rcm rco rcp rcr rcx re- rec ree rei rem reo rep rer rex ric rie rii rim rio rip rir rix rmc rme rmi rmm rmo rmp rmr rmx roc roe roi rom roo rop ror rox rpc rpe rpi rpm rpo rpp rpr rpx rrc rri rrm rrp rrr rxp rxr xci xcp xcr xcx xee xem xep xer xex xic xie xii xio xix xmc xmi xmm xmo xmp xmr xmx xoc xoi xom xoo xop xor xox xpc xpe xpm xpo xpp xrc xrx xxi xxo xxp xxx