a-a aaa aae aaf aag aas aea aee aef aeg aes af- afa afe aff afg afs ag- aga age agf agg ags as- asa ase asf asg ass eaa eae eaf eag eas eea eee eef eeg ees ef- efa efe eff efg efs ega ege egf egg egs es- esa ese esf esg ess faa fae faf fag fas fea fee fef feg fes ffa ffe fff ffg ffs fga fge fgf fgg fgs fsa fse fsf fsg fss gaa gae gaf gag gas ge- gea gee gef geg ges gfa gfe gff gfs gga ggg ggs gsa gse gsf gsg gss saa sae saf sag sas se- sea see sef seg ses sfa sfe sff sfg sfs sga sge sgf sgg sgs ss- ssa sse ssf ssg sss