a-a a-b a-t aaa aab aae aaf aaj aao aat ab- aba abb abe abf abj abo abt aea aeb aee aef aej aeo aet af- afa afb afe aff afj afo aft aja ajb aje ajf ajj ajo ajt aoa aob aoe aof aoj aoo aot at- ata atb ate atf ato att baa bab bae baf baj bao bat bba bbb bbe bbf bbo bbt be- bea beb bee bef beo bet bfa bfb bfe bff bfj bfo bft bja bjf bjj bjt boa bob boe bof boj boo bot bta btb bte btf bto btt eaa eab eae eaf eaj eao eat eba ebb ebe ebf ebj ebo ebt eea eeb eee eef eeo eet ef- efa efb efe eff efo eft eja ejf ejo ejt eo- eoa eob eoe eof eoo eot eta etb ete etf etj eto ett faa fab fae faf faj fao fat fba fbb fbe fbf fbo fbt fea feb fee fef feo fet ffa ffe fff ffo fft fja fjb foa fob foe fof foo fot fta ftb fte ftf fto ftt jaa jab jae jaf jaj jao jat jba jbf jbj jbo jbt jea jeb jee jef jej jeo jet jfa jfb jfe jff jfj jfo jft jja jjb jjf jjj joa job joe jof joj joo jot jta jtb jte jtf jtt oaa oab oae oaf oaj oao oat ob- oba obb obe obf obj obo obt oea oeb oee oef oeo oet of- ofa ofb ofe off ofo oft oja ojb oje ojo oo- ooa oob oof ooo oot ot- ota otb ote otf oto ott taa tab tae taf taj tao tat tba tbb tbe tbf tbj tbo tbt te- tea teb tee tef tej teo tet tfa tfb tfe tff tfj tfo tft tje tjf tjo to- toa tob toe tof toj too tot tta ttb tte ttf tto ttt