a-a aaa aaf aag aah aao aas af- afa aff afg afh afo afs ag- aga agf agg agh ago ags aha ahf ahg ahh aho ahs aoa aof aog aoh aoo aos as- asa asf asg ash aso ass faa faf fag fah fao fas ffa fff ffg ffh ffo ffs fga fgf fgg fgh fgs fha fhf fhg fhh fho fhs foa fof fog foh foo fos fsa fsf fsg fsh fso fss gaa gaf gag gah gao gas gfa gff gfh gfo gfs gga ggg ggh ggo ggs gha ghg ghh gho ghs goa gof gog goh goo gos gsa gsf gsg gso gss haa haf hag hah hao has hfa hff hfg hfh hfo hfs hga hgf hgg hgh hgo hgs hha hhf hhg hhh hho hhs hoa hof hog hoh hoo hos hsa hsf hsg hsh hss oaa oaf oag oah oao oas of- ofa off ofg ofo ofs oga ogf ogg ogh ogo ogs oha ohf ohg ohh oho ohs oo- ooa oof oog ooh ooo oos os- osa osf osg osh oso oss saa saf sag sah sao sas sfa sff sfg sfh sfo sfs sga sgf sgg sgh sgo sgs sh- sha shf shg shh sho shs soa sof sog soh soo sos ss- ssa ssf ssg ssh sso sss