c-- ccc cce cck cco ccp cct ce- cec cee cek ceo cep cet ckc cko ckt co- coc coe cok coo cop cot cpc cpe cpk cpo cpp cpt ctc cte ctk cto ctp ctt ec- ecc ece eck eco ect eec eee eek eeo eep eet ekc eke eko ekp ekt eo- eoc eoe eok eoo eop eot ep- epc epe epo epp ept etc ete etk eto etp ett k-t kcc kce kck kcp kct ke- kec kee kek keo kep ket kkc kke kkk kkp kkt koc koe kok koo kop kot kpc kpe kpk kpo kpp kpt ktc kte ktk kto ktp ktt oc- occ ock oco ocp oct oec oee oeo oep oet okc oke okk oko okp oo- ooc ook ooo oop oot op- opc ope opk opo opp opt ot- otc ote otk oto otp ott p-p pcc pce pck pco pcp pct pec pee pek peo pep pet pkc pke pko pkp pkt poc poe pok poo pop pot ppc ppe ppk ppo ppp ppt pt- ptc pte ptk pto ptp ptt tcc tce tck tco tcp tct te- tec tee tek teo tep tet tkc tke tkk tko tkp tkt to- toc toe tok too top tot tpc tpe tpk tpo tpp tpt ttc tte ttk tto ttp ttt