bbbb bobb bobo boff boko boob boof book boor bor- borf bork boro borr brkb brob brok broo bror brrr f--k ffff ffrr fofo foof fook for- forb fork foro forr frob kbbb kbbf kbbk kbbo kbbr kbfb kbff kbfk kbfo kbfr kbkb kbkf kbkk kbko kbkr kbob kbok kboo kbrb kbrf kbrk kbro kfbk kffb kfff kffk kfkb kfok kfoo kfor kfro kfrr kkbb kkbo kkbr kkfr kkkk kkob kkoo kkor kkrb kkrf kkrk kkro kkrr kobb kobk kobo kobr koff kofk kofo kokb kokf kokk koko kokr koob kook kooo koor korb korf kork koro korr krbb krbk krbr krff krfo krkk krko krkr krob krof krok kroo kror krrb krrf krrk krro krrr obbo obkb obok obor obro off- offo offr ofor okko okok okor okro ooff oooo orbb orbo orff orko oro- orof orok oror orro rbbb rbbr rkkf rob- robb robo roff rofo rokk roko rokr roob roof rook roor rork roro rrrr