a-a a-b a-t aaa aab aar aat aaw aay ab- aba abb abr abt abw aby ar- ara arb arr art arw ary at- ata atb atr att atw aw- awa awb awr awt aww awy ay- aya ayr ayt ayw baa bab bar bat baw bay bba bbb bbr bbt bbw bby bra brb brr brt brw bry bta btb btr btt btw bty bwa bwb bwr bwy by- bya byr byt ra- raa rab rar rat raw ray rba rbb rbr rbt rbw rra rrb rrr rrt rta rtb rtr rtt rtw rty rwa rwb rwr rwy ry- rya ryr ryy taa tab tar tat taw tay tba tbb tbr tbt tra trb trr trt trw try tta ttb ttr ttt ttw tty twa twb twr twt tww twy tya tyr tyt waa wab war wat waw way wba wbb wbr wbt wbw wr- wra wrr wrt wrw wry wta wtb wtr wtt wtw wwa wwt www wy- wya wyr wyt yaa yab yar yat yaw yay ybr yby yra yrt yta ytr ytt yyb yyt yyy