c-- ccc cce ccs cct ccu ce- cec cee ces cet ceu csc cse css cst csu ctc cte cts ctt ctu cuc cue cus cut cuu ec- ecc ece ecs ect ecu eec eee ees eet es- esc ese ess est esu etc ete ets ett etu eu- euc eue eus eut scc sce scs sct scu se- sec see ses set seu ss- ssc sse sss sst ssu stc ste sts stt stu suc sue sus sut suu tcc tce tcs tct tcu te- tec tee tes tet teu tsc tse tss tst tsu ttc tte tts ttt ttu tuc tue tus tut tuu ucc uce ucs uct ucu uec uee ues uet usc use uss ust usu utc ute uts utt utu uuc uue uus uut uuu