a-a a-c aaa aac aae aaf aam aas ac- aca acc ace acf acm acs aea aec aee aef aem aes af- afa afc afe aff afm afs ama amc ame amf amm ams as- asa asc ase asf asm ass c-- caa cac cae caf cam cas cca ccc cce ccf ccm ccs ce- cea cec cee cef cem ces cfa cfc cfe cff cfm cfs cma cmc cme cmf cmm cms csa csc cse csf csm css eaa eac eae eaf eam eas ec- eca ecc ece ecf ecm ecs eea eec eee eef eem ees ef- efa efc efe eff efm efs em- ema emc eme emf emm ems es- esa esc ese esf esm ess faa fac fae faf fam fas fca fcc fce fcf fcm fcs fea fec fee fef fem fes ffa ffc ffe fff ffm ffs fma fmc fme fmf fmm fms fsa fsc fse fsf fsm fss m-f maa mac mae maf mam mas mc- mca mcc mce mcf mcm mcs mea mec mee mef mem mes mfa mfc mfe mff mfm mfs mma mmc mme mmf mmm mms msa msc mse msf msm mss saa sac sae saf sam sas sca scc sce scf scm scs se- sea sec see sef sem ses sfa sfc sfe sff sfm sfs sma smc sme smf smm sms ss- ssa ssc sse ssf ssm sss