a-a aaa aaf aag aah aao aar af- afa aff afg afh afo afr ag- aga agf agg agh ago agr aha ahf ahg ahh aho ahr aoa aof aog aoh aoo aor ar- ara arf arg arh aro arr faa faf fag fah fao far ffa fff ffg ffh ffo ffr fga fgf fgg fgh fgr fha fhf fhg fhh fho fhr foa fof fog foh foo for fra frf frg frh fro frr gaa gaf gag gah gao gar gfa gff gfh gfo gfr gga ggg ggh ggo ggr gha ghg ghh gho ghr goa gof gog goh goo gor gra grf grg grh gro grr haa haf hag hah hao har hfa hff hfg hfh hfo hfr hga hgf hgg hgh hgo hgr hha hhf hhg hhh hho hhr hoa hof hog hoh hoo hor hr- hra hrf hrg hrh hro hrr oaa oaf oag oah oao oar of- ofa off ofg ofo ofr oga ogf ogg ogh ogo oha ohf ohg ohh oho ohr oo- ooa oof oog ooh ooo oor or- ora orf org orh oro orr ra- raa raf rag rah rao rar rfa rff rfg rfh rfo rfr rga rgf rgg rgh rgo rgr rh- rha rhf rhg rhh rho rhr roa rof rog roh roo ror rra rrf rrg rrh rrr