c-- ccc cce ccf cck ccn cco cct ce- cec cee cef cek cen ceo cet cfc cfe cff cfk cfn cfo cft ckc cko ckt cn- cnc cne cnf cnn cno cnt co- coc coe cof cok con coo cot ctc cte ctf ctk ctn cto ctt ec- ecc ece ecf eck ecn eco ect eec eee eef eek een eeo eet ef- efc efe eff efo eft ekc eke ekf eko ekt en- enc ene enf enk enn eno ent eo- eoc eoe eof eok eon eoo eot etc ete etf etk etn eto ett fcc fce fcf fck fcn fco fct fec fee fef fek fen feo fet ffc ffe fff ffk ffn ffo fft fkc fkf fkk fkt fnc fne fnf fnk fnn fnt foc foe fof fok fon foo fot ftc fte ftf ftk ftn fto ftt k-t kcc kce kck kcn kct ke- kec kee kef kek ken keo ket kfc kff kfo kkc kke kkk kkn kkt kn- knc kne knf knk knn kno knt koc koe kof kok kon koo kot ktc kte ktf ktk ktn kto ktt ncc nce ncf nck ncn nco nct ne- nec nee nef nek nen neo net nfc nfe nff nfk nfn nfo nft nkc nke nkf nkk nkn nko nkt nnc nne nnf nnk nnn nno nnt no- noc noe nof nok non noo not ntc nte ntf ntk ntn nto ntt oc- occ ocf ock ocn oco oct oec oee oef oen oeo oet of- ofc ofe off ofn ofo oft okc oke okk oko on- onc one onf onk onn ono ont oo- ooc oof ook oon ooo oot ot- otc ote otf otk otn oto ott tcc tce tcf tck tcn tco tct te- tec tee tef tek ten teo tet tfc tfe tff tfk tfn tfo tft tkc tke tkk tko tkt tnc tne tnf tnk tnn tno tnt to- toc toe tof tok ton too tot ttc tte ttf ttk ttn tto ttt