bbbb bbdd bbeb bd-r bebb bebe bede bedu beeb beed beek beer beke berd bere berk berr beru beuk beur breb bred bree brek brer brkb brrr brud brue bubb bube bubu budb budd bude budu buer bueu buke bukk buku bur- burb burd bure burk burr buru dddd ddre ddub debe debu dedd dede dedu deeb deed deek deer dek- deke der- derb dere derk derr deue deuk deur dred dree drek drub drue druk druu dub- dubb dube dubu dudd dude dudu duer duke duku dure durk duru duur ebbr ebed eber ebru ebur edde ede- eder edru edur eede eedu eeee eeke ekeb eked ekek eker ekur erbb erbe erde ereb ered erer erke erre erub erur eude euer eur- eure kbbb kbbd kbbe kbbk kbbr kbbu kbdb kbde kbdr kbeb kbed kbee kbek kber kbkb kbkk kbkr kbrb kbrd kbre kbrk kbru kbub kbud kbue kbuk kbur kbuu kdbb kdbr kddb kddd kddk kddr kdeb kdkb kdkd kdkk kdkr kdrb kdub kdur kebb kebe kebr kebu kedb kedd kede kedr keed keek keer kekb keke keku ker- kerb kere kerk kerr keru keur kkbb kkbd kkbe kkbr kkdd kked kkkk kkrb kkre kkrk kkrr kkuu krbb krbd krbe krbk krbr krdd krde krdr krdu kreb kred kree krek kreu krkd krke krkk krkr krku krrb krre krrk krrr krue kruk krur kubb kubd kube kubr kubu kudd kude kudu kued kuek kueu kuke kukk kuku kurb kurd kure kurk kurr kuru kuub kuuk kuur kuuu rbbb rbbr rder rebb rebe rebk rebu redd rede redr redu reeb reed reek reke rerd rere reru reue reuk reuu rred rrrr rubb rube rubu rudd rude rued ruer ruke rukk ruku rurd rure ruru ruud ubbe ubek uber ubud uder uduk ukek ukeu ukur urbe urde urdu ure- ured urke urre uruk urur uuuu