a-a aaa aaf aag aah aan aao af- afa aff afg afh afn afo ag- aga agf agg agh agn ago aha ahf ahg ahh ahn aho an- ana anf ang anh ann ano aoa aof aog aoh aon aoo faa faf fag fah fan fao ffa fff ffg ffh ffn ffo fga fgf fgg fgh fgn fha fhf fhg fhh fhn fho fna fnf fng fnh fnn foa fof fog foh fon foo gaa gaf gag gah gan gao gfa gff gfh gfo gga ggg ggh ggn ggo gha ghg ghh ghn gho gna gnf gnn gno goa gof gog goh gon goo haa haf hag hah han hao hfa hff hfg hfh hfn hfo hga hgf hgg hgh hgn hgo hha hhf hhg hhh hhn hho hna hnf hng hnh hnn hno hoa hof hog hoh hon hoo naa naf nag nah nan nao nfa nff nfn nfo nga ngf ngg ngh ngn ngo nha nhf nhg nhh nhn nna nnf nng nnh nnn nno no- noa nof nog noh non noo oaa oaf oag oah oan oao of- ofa off ofg ofn ofo oga ogf ogg ogh ogn ogo oha ohf ohg ohh ohn oho on- ona onf ong onh onn ono oo- ooa oof oog ooh oon ooo