a-a a-c aaa aac aae aaf aam aao aas ac- aca acc ace acf acm aco acs aea aec aee aef aem aeo aes af- afa afc afe aff afm afo afs ama amc ame amf amm amo ams aoa aoc aoe aof aom aoo aos as- asa asc ase asf asm aso ass c-- caa cac cae caf cam cao cas cca ccc cce ccf ccm cco ccs ce- cea cec cee cef cem ceo ces cfa cfc cfe cff cfm cfo cfs cma cmc cme cmf cmm cmo cms co- coa coc coe cof com coo cos csa csc cse csf csm cso css eaa eac eae eaf eam eao eas ec- eca ecc ece ecf ecm eco ecs eea eec eee eef eem eeo ees ef- efa efc efe eff efm efo efs em- ema emc eme emf emm emo ems eo- eoa eoc eoe eof eom eoo eos es- esa esc ese esf esm eso ess faa fac fae faf fam fao fas fca fcc fce fcf fcm fco fcs fea fec fee fef fem feo fes ffa ffc ffe fff ffm ffo ffs fma fmc fme fmf fmm fmo fms foa foc foe fof fom foo fos fsa fsc fse fsf fsm fso fss m-f m-o maa mac mae maf mam mao mas mc- mca mcc mce mcf mcm mco mcs mea mec mee mef mem meo mes mfa mfc mfe mff mfm mfo mfs mma mmc mme mmf mmm mmo mms moa moc moe mof mom moo mos msa msc mse msf msm mso mss oaa oac oae oaf oam oao oas oc- oca occ ocf ocm oco ocs oea oec oee oef oem oeo oes of- ofa ofc ofe off ofm ofo ofs om- oma omc ome omf omm omo oms oo- ooa ooc oof oom ooo oos os- osa osc ose osf osm oso oss saa sac sae saf sam sao sas sca scc sce scf scm sco scs se- sea sec see sef sem seo ses sfa sfc sfe sff sfm sfo sfs sma smc sme smf smm smo sms soa soc soe sof som soo sos ss- ssa ssc sse ssf ssm sso sss