a-do aaaa aaab aaad aaba aabb aabd aabt aada aadt aaoo aata aatt abaa abab abad abat abax abb- abba abbb abbo abbt abda abdo aboa abob abod aboo abot abox abta adaa adab adad adao adat adba adda addd addo adob adod adoo adot adox adta aoba aotd at-t at-x ataa atab atad atat atax atdt atob atod atot atta atto axat axo- axoa axto axxo ba-x baaa baad baat baba babb babo bada badb badd bado bata bato batt baxt bbad bbbb bbdd bbdo bbox boab boad boat boba bobb bobo boda bodb bodo boob bood boot boox bota botb botd boto bott boxa btaa btdt btob bttb d-bo daab daad daba dabb dabo dabt dada dado data dato datt dbtt dddd ddot do-x doab doat doba dobb dod- doda dodd dodo doob dood doot dota dotd doto dott doxa dtaa dtot dtox dttx dtxt dxab dxbt dxxx obad obba obbo obdt obot obox obtd odax odbo odda oddd odoo odot ooaa ooba ooda oooo ootb otbd oto- otoo otta otto oxa- oxo- oxox oxxo taa- taat taba tabb tabo tada tado taoa tata tatb tato tatt tax- taxa taxo taxt tbox tbta tddb toab toad toat toba tobo tobt toda todd todo todt tooa tood toot tota totd toto tott tox- toxa toxo toxt ttab ttbb tttt txaa xado xbox xoxo xxxo xxxx