a-a a-b a-i a-z aaa aab aai aar aaw aaz ab- aba abb abi abr abw abz ai- aia aib aii air aiw aiz ar- ara arb ari arr arw arz aw- awa awb awi awr aww az- aza azb azi azw azz baa bab bai bar baw baz bba bbb bbi bbr bbw bi- bia bib bii bir biw biz bra brb bri brr brw brz bwa bwb bwi bwr bza bzr bzz ia- iaa iab iai iar iaw iaz iba ibb ibi ibr ibw ibz iia iib iii iir iiw ir- ira irb iri irr iwa iwb iwi iwr iww iwz iza izi izz ra- raa rab rai rar raw raz rba rbb rbi rbr rbw ria rib rii rir riz rra rrb rri rrr rwa rwb rwi rwr rza rzb waa wab wai war waw waz wba wbb wbi wbr wbw wbz wia wib wii wir wiz wr- wra wri wrr wrw wwa wwi www zaa zab zai zar zaz zbb zbr zbw zia zib zir ziw ziz zzr zzz