bbbb bibb bibi bibo bimo bio- bioi birb biri biro birr bmir bmmi bobb bobi bobo boi- boii boim bomb bomi boob boom boor bor- bori borm boro borr brim brio brob brom broo bror brrm brrr ibbm ibim ibri ibro iiii iiio iioi iioo imbi imir immi immo imri imro imrr iobi ioii ioio iomo iooi iooo iori irbm iri- irio irmo irob irri mbim mbio miii miio mim- mimi mimo mio- miri miro mirr mmii mmmm mmor mobb mobi mobo moii moio moir momi momo moob moor morb mori moro mrbb mrbm obbo oboi obor obri obro oiii oimb ombo omim omio omo- omoi omoo omor omri omro oobi oooo orbb orbi orbo ori- orio ormo oro- orom oror orri orro rbbb rbbr rib- ribo rimi rimm rimo riom riri rob- robb robi robo roio roir romb romi romm romo roob rooi room roor rori roro rrrr