a-ak a-do a-ok aaaa aaab aaad aaba aabb aabd aabt aada aadt aaka aaoo aata aatk aatt abaa abab abad abak abat abb- abba abbb abbo abbt abda abdo aboa abob abod abok aboo abot abta adaa adab adad adak adao adat adba adda addd addo adob adod adok adoo adot adta akaa akao akka akko akok akot aoba aotd at-t ataa atab atad atak atat atdt atka atkt atob atod atok atot atta atto baaa baad baak baat baba babb babo bada badb badd bado bak- baka bako bakt bata bato batt bbad bbbb bbdd bbdo boab boad boak boat boba bobb bobo boda bodb bodo boka boko boob bood book boot bota botb botd boto bott btaa btdt btob bttb d-bo daab daad daba dabb dabo dabt dada dado daka dako data dato datt dbtt dddd ddot dkba doab doak doat doba dobb dod- doda dodd dodo doka doko doob dood dook doot dota dotd dotk doto dott dtaa dtot kaaa kaab kaak kaat kaba kabb kabd kabo kad- kada kadd kado kadt kaka kakk kako kakt kaoa kaok kat- kata katb katd katk kato katt kbaa kbab kbad kbak kbat kbba kbbb kbbd kbbk kbbo kbbt kbdb kbdo kbkb kbkk kbko kboa kbob kbod kbok kboo kbot kbta kbtb kbtk kbto kbtt kdaa kdab kdad kdak kdao kdat kdbb kddb kddd kddk kdka kdkb kdkd kdkk kdko kdkt kdok kdot kdta kdtd kkaa kkat kkba kkbb kkbd kkbo kkbt kkda kkdd kkdo kkdt kkkk kkoa kkob kkoo kkot kktk koab koak koba kobb kobk kobo koda kodk kodo kodt koka kokb kokk koko koob kook kooo koot kota kotb kotd kotk koto kott ktaa ktak ktao ktat ktba ktbb ktbt ktdb ktdd ktdk ktdo ktkb ktkk ktko ktkt ktob ktok ktoo ktot kttk ktto kttt obad obak obba obbo obdt obkb obok obot obtd odbo odda oddd odoo odot okak okka okko okok okot okta okto ooaa ooak ooba ooda oooo ootb otak otbd oto- otok otoo otta otto taa- taat taba tabb tabo tada tado taka takk tako takt taoa tata tatb tato tatt tbta tddb tkod toab toad toat toba tobo tobt toda todd todo todt toka toko tooa tood took toot tota totd toto tott ttab ttbb tttt