c-- ccc cce ccf cco ccp cct ce- cec cee cef ceo cep cet cfc cfe cff cfo cfp cft co- coc coe cof coo cop cot cpc cpe cpf cpo cpp cpt ctc cte ctf cto ctp ctt ec- ecc ece ecf eco ect eec eee eef eeo eep eet ef- efc efe eff efo efp eft eo- eoc eoe eof eoo eop eot ep- epc epe epf epo epp ept etc ete etf eto etp ett fcc fce fcf fco fcp fct fec fee fef feo fep fet ffc ffe fff ffo ffp fft foc foe fof foo fop fot fpc fpe fpo fpp fpt ftc fte ftf fto ftp ftt oc- occ ocf oco ocp oct oec oee oef oeo oep oet of- ofc ofe off ofo ofp oft oo- ooc oof ooo oop oot op- opc ope opf opo opp opt ot- otc ote otf oto otp ott p-p pcc pce pcf pco pcp pct pec pee pef peo pep pet pfc pfe pff pfo pfp pft poc poe pof poo pop pot ppc ppe ppf ppo ppp ppt pt- ptc pte ptf pto ptp ptt tcc tce tcf tco tcp tct te- tec tee tef teo tep tet tfc tfe tff tfo tfp tft to- toc toe tof too top tot tpc tpe tpf tpo tpp tpt ttc tte ttf tto ttp ttt