bbbbbb bibiri bibiru bibury bidbid biribi bribir bribri brimir brimmy brubru brumby brummy bububu buddhi budrum burbur burdur bururi by-bid ddmmyy ddr-ii dhimmi dhubri didym- diii-d dimdim dimyid dirdum drummr drummy drumry dryrub dubdub dubyuh dumdum durbuy durdum hibhib hibrid hiurud hubbub hubdub hubrid hububb huh-uh humhub humhum humiri hummum hurumu hy-rib hybrid hydrid hyriid ibrium idbury idrimi imbrid imirim irbidi irridu miburi midrib mirihi miruru miyumi mm-hmm muddir muhuhu muhurr muhuru murdur murium murmir murmur muumuu mydrid mymbyr mymymy myrrhy riddim rirumu rubrum rudrur ruhubi rumbud rumbur rumdum udburu uh-huh um-hum umbrid umirim umudim yibbum ymbir- yumyum