c-- ccc ccf cco cct ccu cfc cff cfo cft cfu co- coc cof coo cot cou ctc ctf cto ctt ctu cuc cuf cuo cut cuu fcc fcf fco fct fcu ffc fff ffo fft ffu foc fof foo fot fou ftc ftf fto ftt ftu fuf fuo fut fuu oc- occ ocf oco oct ocu of- ofc off ofo oft ofu oo- ooc oof ooo oot ot- otc otf oto ott otu ou- ouc ouf ouo out tcc tcf tco tct tcu tfc tff tfo tft tfu to- toc tof too tot tou ttc ttf tto ttt ttu tuc tuf tuo tut tuu ucc ucf uco uct ucu ufc uff ufo uft ufu uoc uoo uot utc utf uto utt utu uuc uut uuu