c-- ccc ccd ccs cct ccu cdc cdd cds cdt cdu csc csd css cst csu ctc ctd cts ctt ctu cuc cud cus cut cuu dcc dcd dcs dct dcu ddc ddd dds ddt ddu dsc dsd dss dst dsu dtc dtd dts dtt dtu duc dud dus dut scc scd scs sct scu sdc sdd sds sdt sdu ss- ssc ssd sss sst ssu stc std sts stt stu suc sud sus sut suu tcc tcd tcs tct tcu tdc tdd tds tdt tdu tsc tsd tss tst tsu ttc ttd tts ttt ttu tuc tud tus tut tuu ucc ucd ucs uct ucu udc udd uds udt udu usc usd uss ust usu utc utd uts utt utu uuc uus uut uuu