c-- ccc cce cck cco ccp ccs cct ce- cec cee cek ceo cep ces cet ckc cko cks ckt co- coc coe cok coo cop cos cot cpc cpe cpk cpo cpp cps cpt csc cse csk cso csp css cst ctc cte ctk cto ctp cts ctt ec- ecc ece eck eco ecs ect eec eee eek eeo eep ees eet ekc eke eko ekp eks ekt eo- eoc eoe eok eoo eop eos eot ep- epc epe epo epp eps ept es- esc ese esk eso esp ess est etc ete etk eto etp ets ett k-t kcc kce kck kcp kcs kct ke- kec kee kek keo kep kes ket kkc kke kkk kkp kks kkt koc koe kok koo kop kos kot kpc kpe kpk kpo kpp kps kpt ksc kse ksk kso ksp kss kst ktc kte ktk kto ktp kts ktt oc- occ ock oco ocp ocs oct oec oee oeo oep oes oet okc oke okk oko okp oks oo- ooc ook ooo oop oos oot op- opc ope opk opo opp ops opt os- osc ose osk oso osp oss ost ot- otc ote otk oto otp ots ott p-p pcc pce pck pco pcp pcs pct pec pee pek peo pep pes pet pkc pke pko pkp pks pkt poc poe pok poo pop pos pot ppc ppe ppk ppo ppp pps ppt ps- psc pse psk pso psp pss pst pt- ptc pte ptk pto ptp pts ptt scc sce sck sco scp scs sct se- sec see sek seo sep ses set sk- skc ske skk sko skp sks skt soc soe sok soo sop sos sot spc spe spk spo spp sps spt ss- ssc sse ssk sso ssp sss sst stc ste stk sto stp sts stt tcc tce tck tco tcp tcs tct te- tec tee tek teo tep tes tet tkc tke tkk tko tkp tks tkt to- toc toe tok too top tos tot tpc tpe tpk tpo tpp tps tpt tsc tse tsk tso tsp tss tst ttc tte ttk tto ttp tts ttt