c-- ccc cck cco ccp ccs cct ckc cko cks ckt co- coc cok coo cop cos cot cpc cpk cpo cpp cps cpt csc csk cso csp css cst ctc ctk cto ctp cts ctt k-t kcc kck kcp kcs kct kkc kkk kkp kks kkt koc kok koo kop kos kot kpc kpk kpo kpp kps kpt ksc ksk kso ksp kss kst ktc ktk kto ktp kts ktt oc- occ ock oco ocp ocs oct okc okk oko okp oks oo- ooc ook ooo oop oos oot op- opc opk opo opp ops opt os- osc osk oso osp oss ost ot- otc otk oto otp ots ott p-p pcc pck pco pcp pcs pct pkc pko pkp pks pkt poc pok poo pop pos pot ppc ppk ppo ppp pps ppt ps- psc psk pso psp pss pst pt- ptc ptk pto ptp pts ptt scc sck sco scp scs sct sk- skc skk sko skp sks skt soc sok soo sop sos sot spc spk spo spp sps spt ss- ssc ssk sso ssp sss sst stc stk sto stp sts stt tcc tck tco tcp tcs tct tkc tkk tko tkp tks tkt to- toc tok too top tos tot tpc tpk tpo tpp tps tpt tsc tsk tso tsp tss tst ttc ttk tto ttp tts ttt