c-- ccc cce ccf cco ccp ccs cct ce- cec cee cef ceo cep ces cet cfc cfe cff cfo cfp cfs cft co- coc coe cof coo cop cos cot cpc cpe cpf cpo cpp cps cpt csc cse csf cso csp css cst ctc cte ctf cto ctp cts ctt ec- ecc ece ecf eco ecs ect eec eee eef eeo eep ees eet ef- efc efe eff efo efp efs eft eo- eoc eoe eof eoo eop eos eot ep- epc epe epf epo epp eps ept es- esc ese esf eso esp ess est etc ete etf eto etp ets ett fcc fce fcf fco fcp fcs fct fec fee fef feo fep fes fet ffc ffe fff ffo ffp ffs fft foc foe fof foo fop fos fot fpc fpe fpo fpp fps fpt fsc fse fsf fso fsp fss fst ftc fte ftf fto ftp fts ftt oc- occ ocf oco ocp ocs oct oec oee oef oeo oep oes oet of- ofc ofe off ofo ofp ofs oft oo- ooc oof ooo oop oos oot op- opc ope opf opo opp ops opt os- osc ose osf oso osp oss ost ot- otc ote otf oto otp ots ott p-p pcc pce pcf pco pcp pcs pct pec pee pef peo pep pes pet pfc pfe pff pfo pfp pfs pft poc poe pof poo pop pos pot ppc ppe ppf ppo ppp pps ppt ps- psc pse psf pso psp pss pst pt- ptc pte ptf pto ptp pts ptt scc sce scf sco scp scs sct se- sec see sef seo sep ses set sfc sfe sff sfo sfp sfs sft soc soe sof soo sop sos sot spc spe spf spo spp sps spt ss- ssc sse ssf sso ssp sss sst stc ste stf sto stp sts stt tcc tce tcf tco tcp tcs tct te- tec tee tef teo tep tes tet tfc tfe tff tfo tfp tfs tft to- toc toe tof too top tos tot tpc tpe tpf tpo tpp tps tpt tsc tse tsf tso tsp tss tst ttc tte ttf tto ttp tts ttt