bbbb bbpr bmop bmpt bobb bobo bobu bomb bomp bomt bomu boob boom boop boor boot bopp bor- borm boro borr bort boru botb boto bott boum boup bour bout bpot brob brom broo bror brot brou brrm brrr brum brup brut btbp btob btor btrt bttb bubb bubo bubu bum- bumb bump bur- burb burm buro burp burr burt buru but- buto butt mbou mmmm mmor mmpr mmpu mmrp mobb mobo momo momu moob moop moor moot mopp morb moro mort moru motb motm moto mott motu moup mour mout mppp mpro mprp mptp mrbb mrbm mrtm mrtt mtbo mtom mtor mtrr mttr mubo mumm mumo mump mumu muro murr murt muru muto mutt mutu muut obbo obor obot obro ombo ombu omo- omoo omor ompt omro omuo oooo oort ootb ootp opo- opor oppo opto orbb orbo orbu ormo oro- orom oror orot orro orto orub orum orup oto- otoo otor otpp otro otto ottu otur our- ouro ourt out- outb outo ouu- pbmr pmbr pmmp pmmu pmpm pmpo pmrt pmut pobo pomo pomp pomu poop poor poot pop- popo popp popt porb poro porr port poto pott potu poum poup pour pout pppo pppp pprm ppru pptt ppur pro- prob prom proo prop prot prou prrm prtm prtp prtr prum prut pruu ptmp ptop pubu pump pupu pur- purb puro purp purr puru put- puto putt putu rbbb rbbr rmrp rmtu rob- robb robo robt robu romb romm romo romp roob room roop roor root ropo roro rort roru roto rotr rott roub roum roup rout rpob rrmp rrrr rrum rtmp rttp rubb rubp rubu rumb rumm rumo rump rumt rupp rupt ruro rurp ruru ruto rutt rutu t-mo tbrb tbtp tmbr tmou tmro tmtt tobo tobt tobu tomb tomm tomo tomp tomt toom toor toot top- topo topp topt topu torm toro torp torr tort toru totm toto totr tott toum toup tour tout tpmt tppp tppr tptp tptr tput trmb trmu trom troo trop trot trou trpm trpp trtr trub trut truu ttbb ttop tttt tubb tubo tubr tubu tumb tump tumu tuor tupo tupu turb turm turo turp turr turt turu tuto tutt tutu tuum tuuo u-rp ubbo umb- umbo ummo umor umut uomo uor- upor uppp uppu upto upup uro- urom uroo urpo urum urup urur urut utmb utmp utor utto uttu uuuu