bbb bbc bbf bbm bbs bcb bcc bcf bcm bcs bfb bfc bff bfm bfs bmb bmc bmf bmm bms bsb bsc bsf bsm bss c-- cbb cbc cbf cbm cbs ccb ccc ccf ccm ccs cfb cfc cff cfm cfs cmb cmc cmf cmm cms csb csc csf csm css fbb fbc fbf fbm fbs fcb fcc fcf fcm fcs ffc fff ffm ffs fmb fmc fmf fmm fms fsb fsc fsf fsm fss m-f mbb mbc mbf mbm mbs mc- mcb mcc mcf mcm mcs mfb mfc mff mfm mfs mmb mmc mmf mmm mms msb msc msf msm mss sbb sbc sbf sbm sbs scb scc scf scm scs sfb sfc sff sfm sfs smb smc smf smm sms ss- ssb ssc ssf ssm sss