a-a a-b a-z aaa aab aae aag aao aaz ab- aba abb abe abg abo abz aea aeb aee aeg aeo aez ag- aga agb age agg ago agz aoa aob aoe aog aoo az- aza azb aze azg azo azz baa bab bae bag bao baz bba bbb bbe bbg bbo be- bea beb bee beg beo bez bga bgb bge bgg bgo bgz boa bob boe bog boo boz bza bze bzo bzz eaa eab eae eag eao eaz eba ebb ebe ebg ebo eea eeb eee eeg eeo ega egb ege egg ego eo- eoa eob eoe eog eoo eze ezo ezz gaa gab gae gag gao gaz gba gbe gbg gbo gbz ge- gea geb gee geg geo gez gga ggb ggg ggo ggz goa gob goe gog goo goz gza gzo oaa oab oae oag oao ob- oba obb obe obg obo oea oeb oee oeg oeo oga oge ogg ogo oo- ooa oob oog ooo oza oze ozo ozz z-g zaa zab zag zao zaz zbb zea zeb zee zeo zez zgb zgg zo- zoa zob zoe zog zoo zzz