bbbb bibb bibi bibo bimo bio- bioi biot biou birb biri biro birr birt biru bito bitt bitu bmir bmmi bobb bobi bobo bobu boi- boii boim boit boiu bomb bomi bomt bomu boob boom boor boot bor- bori borm boro borr bort boru botb boti boto bott boum bour bout brim brio brit brob brom broo bror brot brou brrm brrr brum brut btob btor btrt bttb bubb bubi bubo bubu buir buit buiu bum- bumb bur- burb buri burm buro burr burt buru but- buti buto butt ibbm ibim ibot ibri ibro ibtb iiii iiio iiit iioi iioo iitm iitr iitt iium imbi imir imit immi immo immt imou imri imro imrr imto iobi ioii ioio ioit iomo iooi iooo iori ioto irbm iri- irio irmo irob irri irti itim itmo itoi itoo itor itou itri itto itum itur iuiu mbim mbio mbou miii miio miit mim- mimi mimo mio- miri miro mirr mirt miru mit- mitb miti mitm mito mitt mitu miui mmii mmmm mmor mobb mobi mobo moii moio moir moit momi momo momu moob moor moot morb mori moro mort moru motb moti motm moto mott motu mour mout mrbb mrbm mrtm mrtt mtbo mtom mtor mtrr mttr mubi mubo muir muit mumm mumo mumu muri muro murr murt muru muti muto mutt mutu muut obbo obit oboi obor obot obri obro oiii oimb oirt oiti oium ombo ombu omim omio omit omo- omoi omoo omor omri omro omuo oobi oooo oort ootb orbb orbi orbo orbu ori- orio orit ormo oro- orom oror orot orri orro orto orub orum otit oto- otoo otor otro otti otto ottu otur ouii ouir ouit oumi our- ouro ourt out- outb outi outo ouu- rbbb rbbr rib- ribo ribu rimi rimm rimo rimu riom riot riou riri riti rito ritt ritu rmtu rob- robb robi robo robt robu roio roir roit roiu romb romi romm romo roob rooi room roor root rori roro rort roru roti roto rotr rott roub roum rout rrrr rrum rtmi rubb rubi rubu ruit rumb rumi rumm rumo rumt ruri ruro ruru ruti ruto rutt rutu t-mo tbit tbrb tibi tibu tiit tiiu timi timm timo timu tiou tirb tiri tiro tirr tiru titi tito titt titu tium tmbr tmou tmro tmtt tobi tobo tobt tobu toit tomb tomi tomm tomo tomt toom toor toot tori torm toro torr tort toru toti totm toto totr tott toui toum tour tout tri- trib trim trio trit trmb trmi trmu troi trom troo trot trou trtr trub trut truu ttbb ttim tttt tubb tubo tubr tubu tuim tuit tuiu tumb tumi tumu tuor turb turi turm turo turr turt turu tuti tuto tutt tutu tuum tuuo ubbi ubbo ubii ubir ubit uirr umb- umbi umbo umit ummo umor umri umut uomo uor- urbi urib urim uriu urmi uro- urom uroo urri urum urur urut utmb utor utri utti utto uttu uuri uuuu