c-- ccc cce cco ccp ccx ce- cec cee ceo cep cex co- coc coe coo cop cox cpc cpe cpo cpp cpx cxc cxo cxp cxx ec- ecc ece eco ecx eec eee eeo eep eex eo- eoc eoe eoo eop ep- epc epe epo epp epx ex- exc exe exo exp exx oc- occ oco ocp ocx oec oee oeo oep oex oo- ooc ooo oop oox op- opc ope opo opp opx ox- oxc oxo oxx p-p pcc pce pco pcp pcx pec pee peo pep pex poc poe poo pop pox ppc ppe ppo ppp ppx pxc pxe xcp xcx xee xep xex xoc xoo xop xox xpc xpe xpo xpp xxo xxp xxx