bbbb bbci bbfc bbrc bcbc bccc bcci bcfc bcit bcof bcor bctc bftt bibb bibi bibo bicc bici bico biff bifi bio- bioc bioi biot birb biri biro birr birt bitc bito bitt bobb bobi bobo boco boff boi- boii boit boob booc boof boor boot bor- borf bori boro borr bort botb boti boto bott brcb brfc bric brio brit brob broc broo bror brot brrr brtc btcc btfc btob btor btrc btrt bttb c-bo cbbc cbcc cbcr cbct cbfb cbfc cbir cbit cbot cbrt cbtc cbtf ccbc cccb cccc cccf ccci ccfc ccff ccfi ccic ccii ccir ccob ccoc ccrc ccrf ccri ccrt cctb cctc cctt cfbc cfbr cfbt cfcb cfcf cfco cffb cffr cfit cfor cfrb cfrt cftc cftr cibc cibi cibo cicc cici cico cicr cict ciff ciii ciit ciob cior cirb circ ciri ciro cirr cirt citb citf citi cito citt cobb cobi cobo coco coct cofc coff cofi coft coif coir coit coob coof coot cor- corb corc corf cori coro corr cort cotb cotc coti coto cott crbc crcc crcr crfc crib cric crif crit crob croc croo cror crot crrt crtc crtf ctbi ctcf ctfc ctfo ctic ctor ctot ctrc fccf fcic fcii fcot fcto ffcc ffff ffii ffrr fftf ficc fico fict fifc fiff fifi fifo fift fiii fior fitc fiti fitt fobt foci foco fofo foof foot for- forb fori foro forr fort foti foto fott frbc frcc frfc frib fric frio frit frob frot ft-c ftfc ftii ibfi ibot ibrc ibri ibro ibtb ibtc icbc iccb iccc iccf icci icco iccr icct icfb icoc icor icrc icrf icrr icrt ifbb ifco ific ifit ifor ifrb ifrf ifri ifto iiii iiio iiit iioi iioo iirc iitr iitt iobi ioci iofc ioii ioio ioit ioof iooi iooo iori iotf ioto ircc iri- iric irio irob iroc irrc irri irtf irti itic itif itof itoi itoo itor itrf itri ittf itto obbo obit oboi obor obot obri obro ocbc occc occi occt ocro ocrr oct- octi octo ofcr off- offc offo offr ofit ofor oici oiii oirt oitc oiti oobi oocr ooff oooo oort ootb orbb orbi orbo orci orco orff orfi ori- oric orif orio orit oro- orof oror orot orri orro ortc orto otfc otic otif otit oto- otof otoo otor otro otti otto rbbb rbbr rcbc rcbo rccb rccc rcfc rcic rctc rcti rffc rfic rftc rib- ribo ricc rico rict riff rift riif riot riri riti rito ritt rob- robb robi robo robt rocc roco rofc roff rofo roif roio roir roit roob roof rooi roor root rorc rori roro rort rotc roti roto rotr rott rrfc rrif rrrr rtbf rtcc rtfb rtfc tbcb tbcc tbit tbrb tccc tcfc tctc tfot tftc tibi ticc tico tiff tifo tift tiit tirb tiri tiro tirr titc titi tito titt tobi tobo tobt toci toco toff tofi tofo toft toit toof toor toot torc torf tori toro torr tort totc toti toto totr tott trcc trfc trfr tri- trib tric trif trio trit troc troi troo trot trtc trtr ttbb ttfc ttff tttt