a-a a-b a-i a-z aaa aab aag aai aao aaz ab- aba abb abg abi abo abz ag- aga agb agg agi ago agz ai- aia aib aig aii aio aiz aoa aob aog aoi aoo az- aza azb azg azi azo azz baa bab bag bai bao baz bba bbb bbg bbi bbo bga bgb bgg bgi bgo bgz bi- bia bib big bii bio biz boa bob bog boi boo boz bza bzo bzz gaa gab gag gai gao gaz gba gbg gbi gbo gbz gga ggb ggg ggi ggo ggz gia gib gig gii gio giz goa gob gog goi goo goz gza gzo ia- iaa iab iag iai iao iaz iba ibb ibg ibi ibo ibz iga igb igg igi igo iia iib iii iio io- ioa iob iog ioi ioo iza izi izo izz o-i oaa oab oag oai oao ob- oba obb obg obi obo oga ogg ogi ogo oia oib oii oio oiz oo- ooa oob oog ooi ooo oza ozo ozz z-g zaa zab zag zai zao zaz zbb zgb zgg zgi zia zib zig zio ziz zo- zoa zob zog zoi zoo zzz