bbbb bobb bobo bobu bomb bomt bomu boob boom boot botb boto bott boum bout btob bttb bubb bubo bubu bum- bumb but- buto butt mbou mmmm mobb mobo momo momu moob moot motb motm moto mott motu mout mtbo mtom mubo mumm mumo mumu muto mutt mutu muut obbo obot ombo ombu omo- omoo omuo oooo ootb oto- otoo otto ottu out- outb outo ouu- t-mo tmou tmtt tobo tobt tobu tomb tomm tomo tomt toom toot totm toto tott toum tout ttbb tttt tubb tubo tubu tumb tumu tuto tutt tutu tuum tuuo ubbo umb- umbo ummo umut uomo utmb utto uttu uuuu