a-a a-b a-i a-t a-z aaa aab aai aao aat aaz ab- aba abb abi abo abt abz ai- aia aib aii aio ait aiz aoa aob aoi aoo aot at- ata atb ati ato att atz az- aza azb azi azo azt azz baa bab bai bao bat baz bba bbb bbi bbo bbt bi- bia bib bii bio bit biz boa bob boi boo bot boz bta btb bti bto btt btz bza bzo bzz ia- iaa iab iai iao iat iaz iba ibb ibi ibo ibt ibz iia iib iii iio iit io- ioa iob ioi ioo iot ita itb iti ito itt itz iza izi izo izz o-i oaa oab oai oao oat ob- oba obb obi obo obt oia oib oii oio oit oiz oo- ooa oob ooi ooo oot ot- ota otb oti oto ott otz oza ozo ozt ozz taa tab tai tao tat taz tba tbb tbi tbo tbt tbz tia tib tii tio tit tiz to- toa tob toi too tot toz tta ttb tti tto ttt tza zaa zab zai zao zat zaz zbb zbt zia zib zio zit ziz zo- zoa zob zoi zoo zot zta zzt zzz