bbb bbf bbo bbr bbt bfb bff bfo bfr bft bob bof boo bor bot brb brf bro brr brt btb btf bto btr btt fbb fbf fbo fbr fbt fff ffo ffr fft fob fof foo for fot frb frf fro frr frt ftb ftf fto ftr ftt ob- obb obf obo obr obt of- ofb off ofo ofr oft oo- oob oof ooo oor oot or- orb orf oro orr ort ot- otb otf oto otr ott rbb rbf rbo rbr rbt rfb rff rfo rfr rft rob rof roo ror rot rrb rrf rrr rrt rtb rtf rto rtr rtt tbb tbf tbo tbr tbt tfb tff tfo tfr tft to- tob tof too tor tot trb trf tro trr trt ttb ttf tto ttr ttt

bbbb bftt bobb bobo boff boob boof boor boot bor- borf boro borr bort botb boto bott brob broo bror brot brrr btob btor btrt bttb ffff ffrr fftf fobt fofo foof foot for- forb foro forr fort foto fott frob frot obbo obor obot obro off- offo offr ofor ooff oooo oort ootb orbb orbo orff oro- orof oror orot orro orto oto- otof otoo otor otro otto rbbb rbbr rob- robb robo robt roff rofo roob roof roor root roro rort roto rotr rott rrrr rtbf rtfb tbrb tfot tobo tobt toff tofo toft toof toor toot torf toro torr tort toto totr tott trfr troo trot trtr ttbb ttff tttt

bo-bo bobr boffo boort borbo boro- boroo borot borro botro brobo broft broto brrrr btr-t forro forto froot ftrtt o-r-b oboro offof offto ofoto ooooo orbot orfor orobo ortoo ototo ro-ro robbo robo- robor robot robrt rofor rooft roto- rotor rotot rotto tbtbt tobor tobot toffo tofor torob torro torto toto- totoo troff troft trott ttttt

bbbbbb booboo borbor bororo botoro brotto foboff foofoo forrot frbroo oftfor oofotr oooooo ottoor roboto rootof to-fro toboot tootoo tororo tortor totoro totrot trotro

bbbbbbb boo-boo foo-foo footrot forroot off-off oroboro ottrott rootfor rootrot too-too tototoo tro-tro trotoff

bbbbbbbb bo-bo-bo toottoot torotoro

borborbor

footforfoot

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