c-- ccc ccf cck cco ccs cct ccu cfc cff cfk cfo cfs cft cfu ckc cko cks ckt co- coc cof cok coo cos cot cou csc csf csk cso css cst csu ctc ctf ctk cto cts ctt ctu cuc cuf cuk cuo cus cut cuu fcc fcf fck fco fcs fct fcu ffc fff ffk ffo ffs fft ffu fkc fkf fkk fkt foc fof fok foo fos fot fou fsc fsf fsk fso fss fst fsu ftc ftf ftk fto fts ftt ftu fuf fuk fuo fus fut fuu k-t kcc kck kcs kct kcu kfc kff kfo kfs kfu kkc kkk kks kkt kku koc kof kok koo kos kot kou ksc ksf ksk kso kss kst ksu ktc ktf ktk kto kts ktt ktu kuc kuk kus kut kuu oc- occ ocf ock oco ocs oct ocu of- ofc off ofo ofs oft ofu okc okk oko oks oku oo- ooc oof ook ooo oos oot os- osc osf osk oso oss ost osu ot- otc otf otk oto ots ott otu ou- ouc ouf ouk ouo ous out scc scf sck sco scs sct scu sfc sff sfk sfo sfs sft sfu sk- skc skf skk sko sks skt sku soc sof sok soo sos sot sou ss- ssc ssf ssk sso sss sst ssu stc stf stk sto sts stt stu suc suf suk suo sus sut suu tcc tcf tck tco tcs tct tcu tfc tff tfk tfo tfs tft tfu tkc tkk tko tks tkt to- toc tof tok too tos tot tou tsc tsf tsk tso tss tst tsu ttc ttf ttk tto tts ttt ttu tuc tuf tuk tuo tus tut tuu ucc ucf uck uco ucs uct ucu ufc uff ufo ufs uft ufu ukc ukf ukk uku uoc uok uoo uos uot usc usf usk uso uss ust usu utc utf utk uto uts utt utu uuc uus uut uuu