a-a a-b a-t a-z aaa aab aad aao aat aau aaz ab- aba abb abd abo abt abu abz ad- ada adb add ado adt adu adz aoa aob aod aoo aot aou at- ata atb atd ato att atu atz au- aua aub aud auo aut auz az- aza azb azd azo azt azu azz b-u baa bab bad bao bat bau baz bba bbb bbd bbo bbt bbu bda bdb bdd bdo bdt bdu bdz boa bob bod boo bot bou boz bta btb btd bto btt btu btz bua bub bud buo but buu buz bza bzd bzo bzu bzz daa dab dad dao dat dau daz dba dbb dbd dbo dbt dbu dbz dda ddb ddd ddo ddt ddu ddz doa dob dod doo dot dou doz dta dtb dtd dto dtt dtu dtz dua dub dud duo dut duz dza dzb dzd dzo dzu oaa oab oad oao oat oau ob- oba obb obd obo obt obu oda odb odd odo odt odu oo- ooa oob ood ooo oot ot- ota otb otd oto ott otu otz ou- oua oud ouo out oza ozo ozt ozu ozz taa tab tad tao tat tau taz tba tbb tbd tbo tbt tbu tbz tda tdb tdd tdo tdt tdu to- toa tob tod too tot tou toz tta ttb ttd tto ttt ttu tua tub tud tuo tut tuu tuz tza tzd tzu ua- uaa uab uad uao uat uau uaz uba ubb ubo ubt ubu uda udb udd udo udt udu uoa uob uod uoo uot uta utb utd uto utt utu utz uua uut uuu uza uzb uzo uzu zaa zab zad zao zat zaz zbb zbt zdt zo- zoa zob zod zoo zot zou zta zub zud zut zuz zzt zzz