a-a a-b a-t a-z aaa aab aad aao aat aaz ab- aba abb abd abo abt abz ad- ada adb add ado adt adz aoa aob aod aoo aot at- ata atb atd ato att atz az- aza azb azd azo azt azz baa bab bad bao bat baz bba bbb bbd bbo bbt bda bdb bdd bdo bdt bdz boa bob bod boo bot boz bta btb btd bto btt btz bza bzd bzo bzz daa dab dad dao dat daz dba dbb dbd dbo dbt dbz dda ddb ddd ddo ddt ddz doa dob dod doo dot doz dta dtb dtd dto dtt dtz dza dzb dzd dzo oaa oab oad oao oat ob- oba obb obd obo obt oda odb odd odo odt oo- ooa oob ood ooo oot ot- ota otb otd oto ott otz oza ozo ozt ozz taa tab tad tao tat taz tba tbb tbd tbo tbt tbz tda tdb tdd tdo tdt to- toa tob tod too tot toz tta ttb ttd tto ttt tza tzd zaa zab zad zao zat zaz zbb zbt zdt zo- zoa zob zod zoo zot zta zzt zzz