c-- ccc cck cco ccp cct ckc cko ckt co- coc cok coo cop cot cpc cpk cpo cpp cpt ctc ctk cto ctp ctt k-t kcc kck kcp kct kkc kkk kkp kkt koc kok koo kop kot kpc kpk kpo kpp kpt ktc ktk kto ktp ktt oc- occ ock oco ocp oct okc okk oko okp oo- ooc ook ooo oop oot op- opc opk opo opp opt ot- otc otk oto otp ott p-p pcc pck pco pcp pct pkc pko pkp pkt poc pok poo pop pot ppc ppk ppo ppp ppt pt- ptc ptk pto ptp ptt tcc tck tco tcp tct tkc tkk tko tkp tkt to- toc tok too top tot tpc tpk tpo tpp tpt ttc ttk tto ttp ttt