c-- ccc cce cck ccn cco cct ce- cec cee cek cen ceo cet ckc cko ckt cn- cnc cne cnn cno cnt co- coc coe cok con coo cot ctc cte ctk ctn cto ctt ec- ecc ece eck ecn eco ect eec eee eek een eeo eet ekc eke eko ekt en- enc ene enk enn eno ent eo- eoc eoe eok eon eoo eot etc ete etk etn eto ett k-t kcc kce kck kcn kct ke- kec kee kek ken keo ket kkc kke kkk kkn kkt kn- knc kne knk knn kno knt koc koe kok kon koo kot ktc kte ktk ktn kto ktt ncc nce nck ncn nco nct ne- nec nee nek nen neo net nkc nke nkk nkn nko nkt nnc nne nnk nnn nno nnt no- noc noe nok non noo not ntc nte ntk ntn nto ntt oc- occ ock ocn oco oct oec oee oen oeo oet okc oke okk oko on- onc one onk onn ono ont oo- ooc ook oon ooo oot ot- otc ote otk otn oto ott tcc tce tck tcn tco tct te- tec tee tek ten teo tet tkc tke tkk tko tkt tnc tne tnk tnn tno tnt to- toc toe tok ton too tot ttc tte ttk ttn tto ttt