fff ffo ffr fft fof foo for fot frf fro frr frt ftf fto ftr ftt of- off ofo ofr oft oo- oof ooo oor oot or- orf oro orr ort ot- otf oto otr ott rff rfo rfr rft rof roo ror rot rrf rrr rrt rtf rto rtr rtt tff tfo tfr tft to- tof too tor tot trf tro trr trt ttf tto ttr ttt

ffff ffrr fftf fofo foof foot for- foro forr fort foto fott frot off- offo offr ofor ooff oooo oort orff oro- orof oror orot orro orto oto- otof otoo otor otro otto roff rofo roof roor root roro rort roto rotr rott rrrr tfot toff tofo toft toof toor toot torf toro torr tort toto totr tott trfr troo trot trtr ttff tttt

forro forto froot ftrtt offof offto ofoto ooooo orfor ortoo ototo ro-ro rofor rooft roto- rotor rotot rotto toffo tofor torro torto toto- totoo troff troft trott ttttt

foofoo forrot oftfor oofotr oooooo ottoor rootof to-fro tootoo tororo tortor totoro totrot trotro

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

toottoot torotoro