c-- ccc cce ccf ccn cco ccp ce- cec cee cef cen ceo cep cfc cfe cff cfn cfo cfp cn- cnc cne cnf cnn cno cnp co- coc coe cof con coo cop cpc cpe cpf cpn cpo cpp ec- ecc ece ecf ecn eco eec eee eef een eeo eep ef- efc efe eff efo efp en- enc ene enf enn eno enp eo- eoc eoe eof eon eoo eop ep- epc epe epf epn epo epp fcc fce fcf fcn fco fcp fec fee fef fen feo fep ffc ffe fff ffn ffo ffp fnc fne fnf fnn fnp foc foe fof fon foo fop fpc fpe fpn fpo fpp ncc nce ncf ncn nco ncp ne- nec nee nef nen neo nep nfc nfe nff nfn nfo nfp nnc nne nnf nnn nno nnp no- noc noe nof non noo nop npc npe npf npn npo npp oc- occ ocf ocn oco ocp oec oee oef oen oeo oep of- ofc ofe off ofn ofo ofp on- onc one onf onn ono onp oo- ooc oof oon ooo oop op- opc ope opf opn opo opp p-p pcc pce pcf pcn pco pcp pec pee pef pen peo pep pfc pfe pff pfn pfo pfp pn- pnc pne pnf pnn pno pnp poc poe pof pon poo pop ppc ppe ppf ppn ppo ppp