b-u bbb bbf bbo bbr bbt bbu bfb bff bfo bfr bft bfu bob bof boo bor bot bou brb brf bro brr brt bru btb btf bto btr btt btu bub buf buo bur but buu fbb fbf fbo fbr fbt fbu fff ffo ffr fft ffu fob fof foo for fot fou frb frf fro frr frt fru ftb ftf fto ftr ftt ftu fub fuf fuo fur fut fuu ob- obb obf obo obr obt obu of- ofb off ofo ofr oft ofu oo- oob oof ooo oor oot or- orb orf oro orr ort oru ot- otb otf oto otr ott otu ou- ouf ouo our out rbb rbf rbo rbr rbt rbu rfb rff rfo rfr rft rfu rob rof roo ror rot rou rrb rrf rrr rrt rru rtb rtf rto rtr rtt rtu rub ruf ruo rur rut ruu tbb tbf tbo tbr tbt tbu tfb tff tfo tfr tft tfu to- tob tof too tor tot tou trb trf tro trr trt tru ttb ttf tto ttr ttt ttu tub tuf tuo tur tut tuu ubb ubf ubo ubr ubt ubu uff ufo ufr uft ufu uob uoo uor uot ur- urb urf uro urr urt uru utb utf uto utr utt utu uur uut uuu

bbbb bftt bobb bobo bobu boff bofu boob boof boor boot bor- borf boro borr bort boru botb boto bott bouf bour bout brfu brob broo bror brot brou brrr brut btob btor btrt bttb bubb bubo bubu buff bufo bufr bur- burb buro burr burt buru but- buto butt ffff ffrr fftf fobt fofo foof foot for- forb foro forr fort foto fott four fout frob frot frou frub ftub fubb fubu fuff fufu fuor fur- furo furr furt futo futu obbo obor obot obro off- offo offr offu ofor ooff oooo oort ootb orbb orbo orbu orff orfu oro- orof oror orot orro orto orub oto- otof otoo otor otro otto ottu otur ouff our- ouro ourt out- outb outo ouu- rbbb rbbr rob- robb robo robt robu roff rofo roob roof roor root roro rort roru roto rotr rott roub rouf rout rrrr rtbf rtfb rubb rubu ruff rufo ruft ruro ruru ruto rutt rutu tbrb tfot tobo tobt tobu toff tofo toft tofu toof toor toot torf toro torr tort toru toto totr tott tour tout trfr troo trot trou trtr trub trut truu ttbb ttff tttt tubb tubo tubr tubu tuff tufo tuft tufu tuor turb turf turo turr turt turu tuto tutt tutu tuuo ubbo ubtf uofo uor- urff urft uro- uroo urur urut utfo utor utto uttu uutf uuuu

bo-bo bobr boffo boort booru borbo boro- boroo borot borou borro borut botou botro bottu bouto brobo broft broto brout brrrr bruff btr-t buffo buroo burro burru burtt burut buto- butor butot butou butuo butut forro forto forur fotur fourb fouro froot fruto ftrtt fu-fu furbo furo- furor futur o-r-b oboro obout offof offto ofoto ofour ooooo orbot orfor orobo orout ortoo oruro orutu ototo otour ottur oubut ouoro outof outro outto ro-ro robbo robo- robor robot robrt robur rofor rooft rorbu roto- rotor rotot rotto roubt routt rubof rubor ruffo rufo- ruutu tbtbt tbutt tobor tobot tobou toffo tofor torob torro torto tortu toto- totoo touro troff troft trott trout trubu truff truro ttttt tubo- tubof tubou tuotu turbo turbt turot turro turtu turut tutor tutto tuuru ubobo ufofu uforb uroob urour urubu urutu utro- utror uttur uturu ututo uuuuu

bbbbbb booboo borbor bororo botoro boubou bourou boutob brotto brubru brufut brutto bububu burbot burbur burotu burutu butbro buttto buutuo foboff foofoo foofur forout forrot foufou fourof fourou fourto frbroo frobot furfur furour furrfu futuro obturb offutt oftfor oofotr oooooo orrour ottoor outfor outour outtro roboto rootof rotour rotout rotrou routot rubbot ruboff rubout rubro- rubutu rurutu rutour to-fro toboot tootoo torfou tororo tortor tortou totoro totrot tou-fu tourou toutou toutuo trotro tuotuo turbo- turbot turtur tururu tutour tuttut u-boot utroor

bbbbbbb boo-boo bootout borotou bourout bourrou burtoft buttout foo-foo footrot forroot fortubo fou-fou fourtou furrour off-off oroboro ottrott outboob outbutt outfoot outroot rootfor rootout rootrot rub-off rub-out rubbour too-too tortour tototoo touboro tro-tro trotoff trotout trubrot turbott tut-tut ububboo ufotofu

bbbbbbbb bo-bo-bo borututu broubrou buruburu fourbour froufrou roboturb toottoot torotoro tourtour turturro ubbubboo

borborbor four-foot four-four frou-frou tuff-tuff tuotuorou tuttototo

fourtofour outoftrout tutortrout

footforfoot

froufroututu

bbbbbbbbbbbbbbb