c-- ccc cce ccs cct ccu ccx ce- cec cee ces cet ceu cex csc cse css cst csu csx ctc cte cts ctt ctu ctx cuc cue cus cut cuu cxc cxs cxt cxx ec- ecc ece ecs ect ecu ecx eec eee ees eet eex es- esc ese ess est esu esx etc ete ets ett etu etx eu- euc eue eus eut eux ex- exc exe exs ext exu exx scc sce scs sct scu scx se- sec see ses set seu sex ss- ssc sse sss sst ssu ssx stc ste sts stt stu stx suc sue sus sut suu sux sxc sxs sxt sxu t-x tcc tce tcs tct tcu tcx te- tec tee tes tet teu tex tsc tse tss tst tsu tsx ttc tte tts ttt ttu ttx tuc tue tus tut tuu tux txe txs txt txu ucc uce ucs uct ucu uec uee ues uet usc use uss ust usu usx utc ute uts utt utu utx uuc uue uus uut uuu uxc uxt uxu xcx xee xes xet xeu xex xsc xss xst xtc xts xtx xue xus xxx