c-- ccc cce cck cco cct ce- cec cee cek ceo cet ckc cko ckt co- coc coe cok coo cot ctc cte ctk cto ctt ec- ecc ece eck eco ect eec eee eek eeo eet ekc eke eko ekt eo- eoc eoe eok eoo eot etc ete etk eto ett k-t kcc kce kck kct ke- kec kee kek keo ket kkc kke kkk kkt koc koe kok koo kot ktc kte ktk kto ktt oc- occ ock oco oct oec oee oeo oet okc oke okk oko oo- ooc ook ooo oot ot- otc ote otk oto ott tcc tce tck tco tct te- tec tee tek teo tet tkc tke tkk tko tkt to- toc toe tok too tot ttc tte ttk tto ttt