a-a a-b a-t aaa aab aae aag aak aao aat ab- aba abb abe abg abk abo abt aea aeb aee aeg aek aeo aet ag- aga agb age agg agk ago agt aka akb ake akg akk ako aoa aob aoe aog aok aoo aot at- ata atb ate atg ato att baa bab bae bag bak bao bat bba bbb bbe bbg bbk bbo bbt be- bea beb bee beg bek beo bet bga bgb bge bgg bgk bgo bgt bka bkb bke bkg bkk bko bkt boa bob boe bog bok boo bot bta btb bte btg btk bto btt eaa eab eae eag eak eao eat eba ebb ebe ebg ebk ebo ebt eea eeb eee eeg eek eeo eet ega egb ege egg ego egt eka ekb eke ekg eko ekt eo- eoa eob eoe eog eok eoo eot eta etb ete etg etk eto ett gaa gab gae gag gak gao gat gba gbe gbg gbk gbo gbt ge- gea geb gee geg gek geo get gga ggb ggg ggo ggt gka gkb gko gkt goa gob goe gog gok goo got gta gtb gte gtg gtk gto gtt k-t ka- kaa kab kae kag kak kao kat kba kbb kbe kbk kbo ke- kea keb kee keg kek keo ket kga kgb kgo kkb kke kkk kkt koa kob koe kog kok koo kot kta ktb kte ktg ktk kto ktt oaa oab oae oag oak oao oat ob- oba obb obe obg obk obo obt oea oeb oee oeg oeo oet oga oge ogg ogo ogt oka okb oke okg okk oko oo- ooa oob oog ook ooo oot ot- ota otb ote otg otk oto ott taa tab tae tag tak tao tat tba tbb tbe tbg tbk tbo tbt te- tea teb tee teg tek teo tet tga tgb tge tgg tgk tgo tgt tka tkb tke tkg tkk tko tkt to- toa tob toe tog tok too tot tta ttb tte ttg ttk tto ttt