a-a a-b a-t aaa aab aae aag aan aao aat ab- aba abb abe abg abn abo abt aea aeb aee aeg aen aeo aet ag- aga agb age agg agn ago agt an- ana anb ane ang ann ano ant aoa aob aoe aog aon aoo aot at- ata atb ate atg atn ato att baa bab bae bag ban bao bat bba bbb bbe bbg bbn bbo bbt be- bea beb bee beg ben beo bet bga bgb bge bgg bgn bgo bgt bna bnb bne bng bnn bno bnt boa bob boe bog bon boo bot bta btb bte btg btn bto btt eaa eab eae eag ean eao eat eba ebb ebe ebg ebn ebo ebt eea eeb eee eeg een eeo eet ega egb ege egg egn ego egt en- ena enb ene eng enn eno ent eo- eoa eob eoe eog eon eoo eot eta etb ete etg etn eto ett gaa gab gae gag gan gao gat gba gbe gbg gbn gbo gbt ge- gea geb gee geg gen geo get gga ggb ggg ggn ggo ggt gna gnb gne gnn gno gnt goa gob goe gog gon goo got gta gtb gte gtg gtn gto gtt naa nab nae nag nan nao nat nba nbb nbe nbg nbn nbo nbt ne- nea neb nee neg nen neo net nga ngb nge ngg ngn ngo ngt nna nnb nne nng nnn nno nnt no- noa nob noe nog non noo not nta ntb nte ntg ntn nto ntt oaa oab oae oag oan oao oat ob- oba obb obe obg obn obo obt oea oeb oee oeg oen oeo oet oga oge ogg ogn ogo ogt on- ona onb one ong onn ono ont oo- ooa oob oog oon ooo oot ot- ota otb ote otg otn oto ott taa tab tae tag tan tao tat tba tbb tbe tbg tbn tbo tbt te- tea teb tee teg ten teo tet tga tgb tge tgg tgn tgo tgt tna tnb tne tng tnn tno tnt to- toa tob toe tog ton too tot tta ttb tte ttg ttn tto ttt