aaaa aaab aaal aaba aabb aabl aabt aala aall aata aatt abaa abab abal abat abax abb- abba abbb abbt abla abta alaa alal alat alb- alba all- alla alll alta altx alxa at-l at-t at-x ataa atab atal atat atax atla atta axal axat ba-x baaa baal baat baba babb bala ball balt bata batt baxt bbbb bblb blaa blab blat blbt btaa btla bttb laaa laal laat laax laba lala lall lata latt laxa llat llll ltbl lxxx taa- taal taat taba tabb tabl tala tall talx tata tatb tatt tax- taxa taxt tbta tltx ttab ttbb tttt txaa xala xall xtal xxxx