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