c-- ccc ccf cck ccn cco ccs cct cfc cff cfk cfn cfo cfs cft ckc cko cks ckt cn- cnc cnf cnn cno cns cnt co- coc cof cok con coo cos cot csc csf csk csn cso css cst ctc ctf ctk ctn cto cts ctt fcc fcf fck fcn fco fcs fct ffc fff ffk ffn ffo ffs fft fkc fkf fkk fkt fnc fnf fnk fnn fns fnt foc fof fok fon foo fos fot fsc fsf fsk fsn fso fss fst ftc ftf ftk ftn fto fts ftt k-t kcc kck kcn kcs kct kfc kff kfo kfs kkc kkk kkn kks kkt kn- knc knf knk knn kno knt koc kof kok kon koo kos kot ksc ksf ksk ksn kso kss kst ktc ktf ktk ktn kto kts ktt ncc ncf nck ncn nco ncs nct nfc nff nfk nfn nfo nfs nft nkc nkf nkk nkn nko nks nkt nnc nnf nnk nnn nno nns nnt no- noc nof nok non noo nos not nsc nsf nsk nsn nso nss nst ntc ntf ntk ntn nto nts ntt oc- occ ocf ock ocn oco ocs oct of- ofc off ofn ofo ofs oft okc okk oko oks on- onc onf onk onn ono ons ont oo- ooc oof ook oon ooo oos oot os- osc osf osk osn oso oss ost ot- otc otf otk otn oto ots ott scc scf sck scn sco scs sct sfc sff sfk sfn sfo sfs sft sk- skc skf skk sko sks skt snc snf snk snn sno sns snt soc sof sok son soo sos sot ss- ssc ssf ssk ssn sso sss sst stc stf stk stn sto sts stt tcc tcf tck tcn tco tcs tct tfc tff tfk tfn tfo tfs tft tkc tkk tko tks tkt tnc tnf tnk tnn tno tns tnt to- toc tof tok ton too tos tot tsc tsf tsk tsn tso tss tst ttc ttf ttk ttn tto tts ttt