c-- ccc cce ccf cck cco ccp ccs ce- cec cee cef cek ceo cep ces cfc cfe cff cfk cfo cfp cfs ckc cko cks co- coc coe cof cok coo cop cos cpc cpe cpf cpk cpo cpp cps csc cse csf csk cso csp css ec- ecc ece ecf eck eco ecs eec eee eef eek eeo eep ees ef- efc efe eff efo efp efs ekc eke ekf eko ekp eks eo- eoc eoe eof eok eoo eop eos ep- epc epe epf epo epp eps es- esc ese esf esk eso esp ess fcc fce fcf fck fco fcp fcs fec fee fef fek feo fep fes ffc ffe fff ffk ffo ffp ffs fkc fkf fkk fkp foc foe fof fok foo fop fos fpc fpe fpk fpo fpp fps fsc fse fsf fsk fso fsp fss kcc kce kck kcp kcs ke- kec kee kef kek keo kep kes kfc kff kfo kfs kkc kke kkk kkp kks koc koe kof kok koo kop kos kpc kpe kpf kpk kpo kpp kps ksc kse ksf ksk kso ksp kss oc- occ ocf ock oco ocp ocs oec oee oef oeo oep oes of- ofc ofe off ofo ofp ofs okc oke okk oko okp oks oo- ooc oof ook ooo oop oos op- opc ope opf opk opo opp ops os- osc ose osf osk oso osp oss p-p pcc pce pcf pck pco pcp pcs pec pee pef pek peo pep pes pfc pfe pff pfk pfo pfp pfs pkc pke pkf pko pkp pks poc poe pof pok poo pop pos ppc ppe ppf ppk ppo ppp pps ps- psc pse psf psk pso psp pss scc sce scf sck sco scp scs se- sec see sef sek seo sep ses sfc sfe sff sfk sfo sfp sfs sk- skc ske skf skk sko skp sks soc soe sof sok soo sop sos spc spe spf spk spo spp sps ss- ssc sse ssf ssk sso ssp sss