aaaa aaab aaad aaar aaba aabb aabd aabt aada aadt aara aard aart aata aatt abaa abab abad abar abat abax abb- abba abbb abbr abbt abda abra abta adaa adab adad adar adat adba adda addd addr adra adta arab arad arar arat arax arba arda arr- arra arrr arrt arta artr artx at-t at-x ataa atab atad atar atat atax atdt atra atrx atta attr axar axat ba-x baaa baad baar baat baba babb babr bada badb badd badr bar- bara barb bard barr bart barx bata batt baxt bbad bbbb bbdd bd-r brab brad brat brax brda brdt brrr btaa btdt btrt bttb daab daad daar daba dabb dabt dada dara darb dard darr dart data datr datt dbar dbtt dddd draa drab drad drar drat drax drba drda drra dtaa dttx dtxt dxab dxbr dxbt dxdr dxra dxrd dxrr dxrt dxrx dxxr dxxx raab raad raat raba rabb rada radd radr radt radx rara rarb rata ratt raxa rbbb rbbr rrad rrat rrrr rtdt taa- taar taat taba tabb tada tara tarb tard tarr tart tata tatb tatr tatt tax- taxa taxt tbar tbrb tbta tddb tdra traa trab trad trat trax trra trtr ttab ttbb tttt txaa txtr xaar xara xbar xbra xrdb xtar xtra xxxx