c-- ccc cce ccm cco ccp ccx ce- cec cee cem ceo cep cex cmc cme cmm cmo cmp cmx co- coc coe com coo cop cox cpc cpe cpm cpo cpp cpx cxc cxo cxp cxx ec- ecc ece ecm eco ecx eec eee eem eeo eep eex em- emc eme emm emo emp emx eo- eoc eoe eom eoo eop ep- epc epe epm epo epp epx ex- exc exe exo exp exx m-o mc- mcc mce mcm mco mcp mcx mec mee mem meo mep mex mmc mme mmm mmo mmp mmx moc moe mom moo mop mox mpc mpe mpm mpo mpp mpx mxc mxp oc- occ ocm oco ocp ocx oec oee oem oeo oep oex om- omc ome omm omo omp omx oo- ooc oom ooo oop oox op- opc ope opm opo opp opx ox- oxc oxo oxx p-p pcc pce pcm pco pcp pcx pec pee pem peo pep pex pmc pme pmm pmo pmp pmx poc poe pom poo pop pox ppc ppe ppm ppo ppp ppx pxc pxe pxm xcp xcx xee xem xep xex xmc xmm xmo xmp xmx xoc xom xoo xop xox xpc xpe xpm xpo xpp xxo xxp xxx