b-u bbb bbf bbo bbr bbu bfb bff bfo bfr bfu bob bof boo bor bou brb brf bro brr bru bub buf buo bur buu fbb fbf fbo fbr fbu fff ffo ffr ffu fob fof foo for fou frb frf fro frr fru fub fuf fuo fur fuu ob- obb obf obo obr obu of- ofb off ofo ofr ofu oo- oob oof ooo oor or- orb orf oro orr oru ou- ouf ouo our rbb rbf rbo rbr rbu rfb rff rfo rfr rfu rob rof roo ror rou rrb rrf rrr rru rub ruf ruo rur ruu ubb ubf ubo ubr ubu uff ufo ufr ufu uob uoo uor ur- urb urf uro urr uru uur uuu

bbbb bobb bobo bobu boff bofu boob boof boor bor- borf boro borr boru bouf bour brfu brob broo bror brou brrr bubb bubo bubu buff bufo bufr bur- burb buro burr buru ffff ffrr fofo foof for- forb foro forr four frob frou frub fubb fubu fuff fufu fuor fur- furo furr obbo obor obro off- offo offr offu ofor ooff oooo orbb orbo orbu orff orfu oro- orof oror orro orub ouff our- ouro ouu- rbbb rbbr rob- robb robo robu roff rofo roob roof roor roro roru roub rouf rrrr rubb rubu ruff rufo ruro ruru ubbo uofo uor- urff uro- uroo urur uuuu

bo-bo bobr boffo booru borbo boro- boroo borou borro brobo brrrr bruff buffo buroo burro burru forro forur fourb fouro fu-fu furo- furor o-r-b oboro offof ofour ooooo orfor orobo oruro ouoro ro-ro robbo robo- robor robur rofor rorbu rubof rubor ruffo rufo- ubobo ufofu uforb uroob urour urubu uuuuu

bbbbbb booboo borbor bororo boubou bourou brubru bububu burbur foboff foofoo foofur foufou fourof fourou frbroo furfur furour furrfu oooooo orrour ruboff rubro-

bbbbbbb boo-boo bourrou foo-foo fou-fou furrour off-off oroboro rub-off rubbour ububboo

bbbbbbbb bo-bo-bo broubrou buruburu fourbour froufrou ubbubboo

borborbor four-four frou-frou

bbbbbbbbbbbbbbb