-hou bbbb bbrg bhog bhor bhur bhuu bobb bobo bobu bogg bogh bogo boho bohr bohu boob boog booh boor bor- borg borh boro borr boru bouh bour brob brog broh broo bror brou brrr brug bruh bubb bubo bubu bugg bugh bugo buho buhr bur- burb burg burh buro burr buru gbbo gggg gghg ghug gobo gogh gogo gohb goog goor gorb gorg goro gorr gou- goug gour grbr grob grog groh groo gror grou grrr grub grug grur gubb gubu gugb gugg gugh gugu guhr gurb gurg gurh guro gurr guru hhgg hhhh hobo hogg hogh hogo hogu hoho hoor horg horo horr hour hrob hubb hubo hugg hugh hugo huhu huor huro hurr huru huub obbo obor obrh obro obuh ogb ogog ogou ogro ohgr ohho ohob ohoh ooho oooh oooo orbb orbo orbu orgo oro- oror orro orub ough our- ouro ouu- rbbb rbbr rbgh rboh rhbg rhob rhog rhoh rhug rob- robb robo robu rogg rogh rogo rohr rohu roob roog roor roro roru roub rouh rrrr rubb rubu rugg rugh ruhh ruhr ruro ruru ubbo uggo ugro ugur uguu uhoh uhuh uor- urgh urgu urho uro- uroo urrh urur uuuu