c-- ccc ccm ccn ccs cct cmc cmm cmn cms cmt cn- cnc cnm cnn cns cnt csc csm csn css cst ctc ctm ctn cts ctt mc- mcc mcm mcn mcs mct mmc mmm mmn mms mmt mnc mnm mnn mns mnt msc msm msn mss mst mtc mtm mtn mts mtt ncc ncm ncn ncs nct nmc nmm nmn nms nmt nnc nnm nnn nns nnt nsc nsm nsn nss nst ntc ntm ntn nts ntt scc scm scn scs sct smc smm smn sms smt snc snm snn sns snt ss- ssc ssm ssn sss sst stc stm stn sts stt tcc tcm tcn tcs tct tmc tmm tmn tms tmt tnc tnm tnn tns tnt tsc tsm tsn tss tst ttc ttm ttn tts ttt