b-r-k bbbee be-er bebek beber becke becue becum beebe beeke beker bekke bembe bemer berbe berck bercu berec berek berk- berke berme berre berru berum beuer beure brebu brece breck breek breem breer breke breme bremm brere breu- brmmm brrrr bruce bruck bruer bruke brume brumm bubbe buber bucek bucku bucum bucur buker bukk- bumbu bumme burck burcu burek burke burru buruc buruk ccccc cebec ceber cecum ceere cemec cemre cerbu cerc- cerce cerec cerer cerke cerre cmere crebe crece creek creem creer creke creme creu- creue cruce cruck cruke crumb crume crure cubbe cubeb cuber cubub cucuk cuker cumbe cumbu cumec cumm- curce curer curre ebber ebure ecker ecume eecke eeeee eembc ekker ekmek ekrem ekuku ekuru embee ember embue emcee emeer emere emerk emmer emure erbbe erber erem- erere erkec eruke eucre eum-u eurre k-mer kebbe kebek keber kecer keere kekec kekem kemer kemme kerek kerem kerre kreek kreke kreme kreuk krumm kubek kuber kucer kucuk kukec kukur kumeu kumru kumuk kurbu kurek kurem kurku kurre kuruc kuruk mbebe mbeku mbere mbube mburu mcbee mccue mckee mcree mcube mebbe mecum meece meemu meere meker membe memer merce merck merer merke merre merur meuer meure mmccc mmmcc mmmmm mrcub mreru mucke mucum mucur muker mukke mukur mumbe mumcu mumme mummu murck mureu murre murru muruk murum rebbe rebec reber recce recke recue recur reece reeme reere rekem rekke remee remer remue rere- reree rerum reuer reume rubee ruber rubke rucer ruere rukke rumbe rumer rummu rurec u-cee uber- ubume uceku ukeke umbe- umber umbre umeer umeme ureme urker urubu uruce urucu uuuuu