b-room bbbbbb bombom bombur booboo boom-o borbor boromo bororo botoro bottom boubou bourou boutob bromo- brotto brubru brutto brutum bububu bumboo bumout burbot burbur burotu burutu butbro buttto buutuo mbombo mbomou mobutu mommur moomoo morbut mormor mormur moroto morrot motmot motomu motor- motoro motour moturu mourou mrmoto murmur muroto mutomo muttur mutuum muumuu obturb ombro- oomoto oooooo oromoo orrour otmoor ottoor outour outtro robomb roboto romour roomto rotour rotout rotrou rottum routot rubbot rubout rubro- rubrum rubutu rumbur rumour rurutu rutour t-room toboot tommot tomort tomtom tomtor tootoo tororo tortor tortou tortum totoro totrot tourou toutou toutuo trombo trotro trumbo tumour tumtum tuotuo turbo- turbot turmut turrum turtur tururu tutour tuttut u-boot ubombo utroor