a-a aaa aad aaf aag aan aao ad- ada add adf adg adn ado af- afa afd aff afg afn afo ag- aga agd agf agg agn ago an- ana and anf ang ann ano aoa aod aof aog aon aoo daa dad daf dag dan dao dda ddd ddf ddg ddn ddo dfa dfd dff dfg dfn dfo dga dgd dgf dgg dgn dna dnd dnf dng dnn dno doa dod dof dog don doo faa fad faf fag fan fao fda fdd fdf fdg fdn fdo ffa ffd fff ffg ffn ffo fga fgd fgf fgg fgn fna fnd fnf fng fnn foa fof fog fon foo g-d gaa gad gaf gag gan gao gda gdd gdf gdn gdo gfa gfd gff gfo gga ggd ggg ggn ggo gna gnd gnf gnn gno goa god gof gog gon goo naa nad naf nag nan nao nda ndd ndf ndg ndn ndo nfa nfd nff nfn nfo nga ngd ngf ngg ngn ngo nna nnf nng nnn nno no- noa nod nof nog non noo oaa oad oaf oag oan oao oda odd odf odg odn odo of- ofa ofd off ofg ofn ofo oga ogd ogf ogg ogn ogo on- ona ond onf ong onn ono oo- ooa ood oof oog oon ooo