c-- ccc cce ccn cco ccp ccs ce- cec cee cen ceo cep ces cn- cnc cne cnn cno cnp cns co- coc coe con coo cop cos cpc cpe cpn cpo cpp cps csc cse csn cso csp css ec- ecc ece ecn eco ecs eec eee een eeo eep ees en- enc ene enn eno enp ens eo- eoc eoe eon eoo eop eos ep- epc epe epn epo epp eps es- esc ese esn eso esp ess ncc nce ncn nco ncp ncs ne- nec nee nen neo nep nes nnc nne nnn nno nnp nns no- noc noe non noo nop nos npc npe npn npo npp nps nsc nse nsn nso nsp nss oc- occ ocn oco ocp ocs oec oee oen oeo oep oes on- onc one onn ono onp ons oo- ooc oon ooo oop oos op- opc ope opn opo opp ops os- osc ose osn oso osp oss p-p pcc pce pcn pco pcp pcs pec pee pen peo pep pes pn- pnc pne pnn pno pnp pns poc poe pon poo pop pos ppc ppe ppn ppo ppp pps ps- psc pse psn pso psp pss scc sce scn sco scp scs se- sec see sen seo sep ses snc sne snn sno snp sns soc soe son soo sop sos spc spe spn spo spp sps ss- ssc sse ssn sso ssp sss