c-- ccc cce cco ccp ccs cct ce- cec cee ceo cep ces cet co- coc coe coo cop cos cot cpc cpe cpo cpp cps cpt csc cse cso csp css cst ctc cte cto ctp cts ctt ec- ecc ece eco ecs ect eec eee eeo eep ees eet eo- eoc eoe eoo eop eos eot ep- epc epe epo epp eps ept es- esc ese eso esp ess est etc ete eto etp ets ett oc- occ oco ocp ocs oct oec oee oeo oep oes oet oo- ooc ooo oop oos oot op- opc ope opo opp ops opt os- osc ose oso osp oss ost ot- otc ote oto otp ots ott p-p pcc pce pco pcp pcs pct pec pee peo pep pes pet poc poe poo pop pos pot ppc ppe ppo ppp pps ppt ps- psc pse pso psp pss pst pt- ptc pte pto ptp pts ptt scc sce sco scp scs sct se- sec see seo sep ses set soc soe soo sop sos sot spc spe spo spp sps spt ss- ssc sse sso ssp sss sst stc ste sto stp sts stt tcc tce tco tcp tcs tct te- tec tee teo tep tes tet to- toc toe too top tos tot tpc tpe tpo tpp tps tpt tsc tse tso tsp tss tst ttc tte tto ttp tts ttt