a-a a-b a-i a-t a-z aaa aab aai aar aat aaz ab- aba abb abi abr abt abz ai- aia aib aii air ait aiz ar- ara arb ari arr art arz at- ata atb ati atr att atz az- aza azb azi azt azz baa bab bai bar bat baz bba bbb bbi bbr bbt bi- bia bib bii bir bit biz bra brb bri brr brt brz bta btb bti btr btt btz bza bzr bzz ia- iaa iab iai iar iat iaz iba ibb ibi ibr ibt ibz iia iib iii iir iit ir- ira irb iri irr irt ita itb iti itt itz iza izi izz ra- raa rab rai rar rat raz rba rbb rbi rbr rbt ria rib rii rir rit riz rra rrb rri rrr rrt rta rtb rti rtr rtt rtz rza rzb taa tab tai tar tat taz tba tbb tbi tbr tbt tbz tia tib tii tir tit tiz tra trb tri trr trt trz tta ttb tti ttr ttt tza zaa zab zai zar zat zaz zbb zbr zbt zia zib zir zit ziz zta ztr zzr zzt zzz