b-r-k bbbee bbook be-er be-ro bebek beber beebe beeke beker bekke bekko bekok beour berbe berek berk- berke berko berob beroe berok beror berre berru beuer beure bo-bo bobek bobko bobok bobr bobre boeke boero boeur bokeo boker bokko bokok bokor booer booke booko boore booru borbo boree borek borer borko borku boro- borok boroo borou borre borro bouee bouer bouke bouko boure brebu breek breer breke breo- brere breu- brobo broek broer broke brook broue brouk brrrr bruer bruke bubbe buber buker bukk- bukor burek burke buroo burro burru buruk ebber ebeko ebook eboue ebure eeeee ekeko ekker ekuku ekuru eorre erbbe erber erere erkko eroor erore error eruke eubro euro- eurre k-rob kebbe kebek keber kebob keere kerek kerre ko-ko kobee kober kobru kobuk koeru koker kokko kokor kokou kokre kokur kooru korbe korbo korek korke korku koror korro korue koruk kouer koure kre-o kreek kreke kreo- kreuk kroke kubek kuber kubok kukko kukok kukur kurbu kurek kurku kurre kuruk o-r-b oboro oboue obreb obrok okeke okere okker okkur okobo okoro okubo okuku okuru oo-er ooooo oreo- orere orero orobe orobo oroer oroke orube oruku oruro ouoro oure- rebbe reber reere rekke rere- reree rerob reuer ro-ro robbe robbo rober robo- robor robur roero rokee roker rokke rokkk rooer rooke roore rooue rorbu rorer rorke rouer rouke rouko roure rubee ruber rubke rubor ruere rukke uber- ubobo ukeke ukobu uouee ureo- urker uroob urour urubu uuork uuuuu