c-- ccc ccm ccn ccr ccs cmc cmm cmn cmr cms cn- cnc cnm cnn cnr cns crc crm crn crr crs csc csm csn csr css m-r mc- mcc mcm mcn mcr mcs mmc mmm mmn mmr mms mnc mnm mnn mnr mns mrc mrm mrn mrr mrs msc msm msn msr mss ncc ncm ncn ncr ncs nmc nmm nmn nmr nms nnc nnm nnn nns nrc nrm nrn nrr nrs nsc nsm nsn nsr nss rcc rcm rcn rcr rcs rmc rmm rmn rmr rms rnc rnm rnn rnr rns rrc rrm rrn rrr rrs rsc rsm rsn rsr rss scc scm scn scr scs smc smm smn smr sms snc snm snn snr sns sr- src srm srn srr srs ss- ssc ssm ssn ssr sss