bbbb bibb bibi bibo bimo bio- bioi biot birb biri biro birr birt bito bitt bmir bmmi bobb bobi bobo boi- boii boim boit bomb bomi bomt boob boom boor boot bor- bori borm boro borr bort botb boti boto bott brim brio brit brob brom broo bror brot brrm brrr btob btor btrt bttb ibbm ibim ibot ibri ibro ibtb iiii iiio iiit iioi iioo iitm iitr iitt imbi imir imit immi immo immt 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 itri itto mbim mbio miii miio miit mim- mimi mimo mio- miri miro mirr mirt mit- mitb miti mitm mito mitt mmii mmmm mmor mobb mobi mobo moii moio moir moit momi momo moob moor moot morb mori moro mort motb moti motm moto mott mrbb mrbm mrtm mrtt mtbo mtom mtor mtrr mttr obbo obit oboi obor obot obri obro oiii oimb oirt oiti ombo omim omio omit omo- omoi omoo omor omri omro oobi oooo oort ootb orbb orbi orbo ori- orio orit ormo oro- orom oror orot orri orro orto otit oto- otoo otor otro otti otto rbbb rbbr rib- ribo rimi rimm rimo riom riot riri riti rito ritt rob- robb robi robo robt roio roir roit romb romi romm romo roob rooi room roor root rori roro rort roti roto rotr rott rrrr rtmi t-mo tbit tbrb tibi tiit timi timm timo tirb tiri tiro tirr titi tito titt tmbr tmro tmtt tobi tobo tobt toit tomb tomi tomm tomo tomt toom toor toot tori torm toro torr tort toti totm toto totr tott tri- trib trim trio trit trmb trmi troi trom troo trot trtr ttbb ttim tttt