bbbb bobb bobo boko bomb boob book boom boor bor- bork borm boro borr brkb brob brok brom broo bror brrm brrr kbbb kbbk kbbm kbbo kbbr kbkb kbkk kbko kbkr kbmb kbmo kbmr kbob kbok kboo kbrb kbrk kbro kkbb kkbo kkbr kkkk kkmk kkmo kkmr kkob kkoo kkor kkrb kkrk kkro kkrr kmbr kmkk kmko kmmk kmmm kmmo kmmr kmob kmok kmom kmor kmrb kmro kmrr kobb kobk kobo kobr kokb kokk koko kokr komb komo komr koob kook kooo koor korb kork koro korr krbb krbk krbm krbr krkk krko krkr krmb krmo krmr krob krok krom kroo kror krrb krrk krrm krro krrr mmmm mmor mobb mobo moko momo moob mook moor morb mork moro mrbb mrbm mrkr obbo obkb obok obor obro okko okmo okok okom okor okro ombo omo- omoo omor omro oooo orbb orbo orko ormo oro- orok orom oror orro rbbb rbbr rbmk rob- robb robo rokk roko rokr romb romk romm romo roob rook room roor rork roro rrkm rrrr