a-a a-b a-i a-t a-z aaa aab aag aai aar aat aaz ab- aba abb abg abi abr abt abz ag- aga agb agg agi agr agt agz ai- aia aib aig aii air ait aiz ar- ara arb arg ari arr art arz at- ata atb atg ati atr att atz az- aza azb azg azi azt azz baa bab bag bai bar bat baz bba bbb bbg bbi bbr bbt bga bgb bgg bgi bgr bgt bgz bi- bia bib big bii bir bit biz bra brb brg bri brr brt brz bta btb btg bti btr btt btz bza bzr bzz gaa gab gag gai gar gat gaz gba gbg gbi gbr gbt gbz gga ggb ggg ggi ggr ggt ggz gia gib gig gii gir git giz gra grb grg gri grr grt gta gtb gtg gti gtr gtt gza gzr ia- iaa iab iag iai iar iat iaz iba ibb ibg ibi ibr ibt ibz iga igb igg igi igr igt iia iib iii iir iit ir- ira irb irg iri irr irt ita itb itg iti itt itz iza izi izz ra- raa rab rag rai rar rat raz rba rbb rbg rbi rbr rbt rga rgb rgg rgi rgr rgt ria rib rig rii rir rit riz rra rrb rrg rri rrr rrt rta rtb rtg rti rtr rtt rtz rza rzb taa tab tag tai tar tat taz tba tbb tbg tbi tbr tbt tbz tga tgb tgg tgi tgr tgt tgz tia tib tig tii tir tit tiz tra trb trg tri trr trt trz tta ttb ttg tti ttr ttt tza z-g zaa zab zag zai zar zat zaz zbb zbr zbt zgb zgg zgi zia zib zig zir zit ziz zta ztr zzr zzt zzz