a-a a-t aaa aaf aag aan aao aat af- afa aff afg afn afo aft ag- aga agf agg agn ago agt an- ana anf ang ann ano ant aoa aof aog aon aoo aot at- ata atf atg atn ato att faa faf fag fan fao fat ffa fff ffg ffn ffo fft fga fgf fgg fgn fgt fna fnf fng fnn fnt foa fof fog fon foo fot fta ftf ftg ftn fto ftt gaa gaf gag gan gao gat gfa gff gfo gft gga ggg ggn ggo ggt gna gnf gnn gno gnt goa gof gog gon goo got gta gtf gtg gtn gto gtt naa naf nag nan nao nat nfa nff nfn nfo nft nga ngf ngg ngn ngo ngt nna nnf nng nnn nno nnt no- noa nof nog non noo not nta ntf ntg ntn nto ntt oaa oaf oag oan oao oat of- ofa off ofg ofn ofo oft oga ogf ogg ogn ogo ogt on- ona onf ong onn ono ont oo- ooa oof oog oon ooo oot ot- ota otf otg otn oto ott taa taf tag tan tao tat tfa tff tfg tfn tfo tft tga tgf tgg tgn tgo tgt tna tnf tng tnn tno tnt to- toa tof tog ton too tot tta ttf ttg ttn tto ttt