a-a a-b a-t a-z aaa aab aae aao aat aau aaz ab- aba abb abe abo abt abu abz aea aeb aee aeo aet aeu aez aoa aob aoe aoo aot aou at- ata atb ate ato att atu atz au- aua aub aue auo aut auz az- aza azb aze azo azt azu azz b-u baa bab bae bao bat bau baz bba bbb bbe bbo bbt bbu be- bea beb bee beo bet beu bez boa bob boe boo bot bou boz bta btb bte bto btt btu btz bua bub bue buo but buu buz bza bze bzo bzu bzz eaa eab eae eao eat eau eaz eba ebb ebe ebo ebt ebu eea eeb eee eeo eet eo- eoa eob eoe eoo eot eou eta etb ete eto ett etu etz eu- eua eub eue eut eze ezo ezz oaa oab oae oao oat oau ob- oba obb obe obo obt obu oea oeb oee oeo oet oo- ooa oob ooo oot ot- ota otb ote oto ott otu otz ou- oua oue ouo out oza oze ozo ozt ozu ozz taa tab tae tao tat tau taz tba tbb tbe tbo tbt tbu tbz te- tea teb tee teo tet teu tez to- toa tob toe too tot tou toz tta ttb tte tto ttt ttu tua tub tue tuo tut tuu tuz tza tze tzu ua- uaa uab uae uao uat uau uaz uba ubb ube ubo ubt ubu uea ueb uee uet uoa uob uoe uoo uot uta utb ute uto utt utu utz uua uue uut uuu uza uzb uzo uzu zaa zab zao zat zaz zbb zbt zea zeb zee zeo zet zez zo- zoa zob zoe zoo zot zou zta zte zub zut zuz zzt zzz