c-- ccc cce ccn ccp ccs cct ce- cec cee cen cep ces cet cn- cnc cne cnn cnp cns cnt cpc cpe cpn cpp cps cpt csc cse csn csp css cst ctc cte ctn ctp cts ctt ec- ecc ece ecn ecs ect eec eee een eep ees eet en- enc ene enn enp ens ent ep- epc epe epn epp eps ept es- esc ese esn esp ess est etc ete etn etp ets ett ncc nce ncn ncp ncs nct ne- nec nee nen nep nes net nnc nne nnn nnp nns nnt npc npe npn npp nps npt nsc nse nsn nsp nss nst ntc nte ntn ntp nts ntt p-p pcc pce pcn pcp pcs pct pec pee pen pep pes pet pn- pnc pne pnn pnp pns pnt ppc ppe ppn ppp pps ppt ps- psc pse psn psp pss pst pt- ptc pte ptn ptp pts ptt scc sce scn scp scs sct se- sec see sen sep ses set snc sne snn snp sns snt spc spe spn spp sps spt ss- ssc sse ssn ssp sss sst stc ste stn stp sts stt tcc tce tcn tcp tcs tct te- tec tee ten tep tes tet tnc tne tnn tnp tns tnt tpc tpe tpn tpp tps tpt tsc tse tsn tsp tss tst ttc tte ttn ttp tts ttt