bbbb bftt bibb bibi bibo biff bifi bimo bio- bioi biot birb biri biro birr birt bito bitt bmir bmmi bobb bobi bobo boff boi- boii boim boit bomb bomi bomt boob boof boom boor boot bor- borf bori borm boro borr bort botb boti boto bott brfm brim brio brit brob brom broo bror brot brrm brrr btob btor btrt bttb fbom ffff ffii ffrr fftf fiff fifi fifm fifo fift fiii fimo fimr fior firm fiti fitt fmri fobt fofo fomo fomt foof foom foot for- forb fori form foro forr fort foti fotm foto fott frib frim frio frit frob from frot ftii ibbm ibfi ibim ibot ibri ibro ibtb ifbb ifim ifit ifor ifrb ifrf ifri ifto iiii iiio iiit iioi iioo iitm iitr iitt imbi imfi imir imit immi immo immt imof imri imro imrr imto iobi ioii ioio ioit iomo ioof iooi iooo iori iotf ioto irbm irfm iri- irio irmo irob irri irtf irti itif itim itmo itof itoi itoo itor itrf itri ittf itto mbim mbio mfbm mfor mfri mftf miff mifi miii miio miit mim- mimi mimo mio- miri miro mirr mirt mit- mitb miti mitm mito mitt mmff mmii mmmm mmor mmrf mobb mobi mobo moff mofo moif moii moio moir moit momi momo moob moor moot morb morf mori moro mort motb moti motm moto mott mrbb mrbm mrtm mrtt mtbo mtff mtom mtor mtrr mttr obbo obit oboi obor obot obri obro off- offo offr ofit ofor oiii oimb oirt oiti ombo omim omio omit omo- omoi omoo omor omri omro oobi ooff oooo oort ootb orbb orbi orbo orff orfi ori- orif orio orit ormo oro- orof orom oror orot orri orro orto otif otit oto- otof otoo otor otro otti otto rbbb rbbr rib- ribo riff rift riif rimi rimm rimo riom riot riri riti rito ritt rmif rob- robb robi robo robt roff rofo roif roio roir roit romb romi romm romo roob roof rooi room roor root rori roro rort roti roto rotr rott rrif rrrr rtbf rtfb rtfm rtmi t-mo tbit tbrb tfot tibi tiff tifo tift tiit timi timm timo tirb tiri tiro tirr titi tito titt tmbr tmro tmtt tobi tobo tobt toff tofi tofo toft toit tomb tomi tomm tomo tomt toof toom toor toot torf tori torm toro torr tort toti totm toto totr tott trfm trfr tri- trib trif trim trio trit trmb trmi troi trom troo trot trtr ttbb ttff ttim tttt