c-- ccc ccm ccs cct ccu cmc cmm cms cmt cmu csc csm css cst csu ctc ctm cts ctt ctu cuc cum cus cut cuu mc- mcc mcm mcs mct mcu mmc mmm mms mmt mmu msc msm mss mst msu mtc mtm mts mtt mtu muc mum mus mut muu scc scm scs sct scu smc smm sms smt smu ss- ssc ssm sss sst ssu stc stm sts stt stu suc sum sus sut suu tcc tcm tcs tct tcu tmc tmm tms tmt tmu tsc tsm tss tst tsu ttc ttm tts ttt ttu tuc tum tus tut tuu ucc ucm ucs uct ucu um- umc umm ums umt umu usc usm uss ust usu utc utm uts utt utu uuc uum uus uut uuu