c-- ccc cco ccs cct ccu co- coc coo cos cot cou csc cso css cst csu ctc cto cts ctt ctu cuc cuo cus cut cuu oc- occ oco ocs oct ocu oo- ooc ooo oos oot os- osc oso oss ost osu ot- otc oto ots ott otu ou- ouc ouo ous out scc sco scs sct scu soc soo sos sot sou ss- ssc sso sss sst ssu stc sto sts stt stu suc suo sus sut suu tcc tco tcs tct tcu to- toc too tos tot tou tsc tso tss tst tsu ttc tto tts ttt ttu tuc tuo tus tut tuu ucc uco ucs uct ucu uoc uoo uos uot usc uso uss ust usu utc uto uts utt utu uuc uus uut uuu