bbbb bbch bbrc bcbc bccc bcor bhcc bhor bobb bobo boch bock boco boho bohr boko boob booc booh book boor bor- borh bork boro borr brcb brkb brob broc broh brok broo bror brrr c-bo cbbc cbcc cbcr cbko cbkr cbrh ccbc cccb cccc cchr ccob ccoc ccrc chch chkb choc choh chok choo chor chrb chrc chro chrr ckbc ckch ckck ckco ckob ckoc ckoo ckor ckrc cobb cobh cobo coch cock coco coho cok- coko coob cooh cook cor- corb corc cork coro corr crbc crcc crcr crkc crob croc croh crok croo cror hboc hcbc hccb hccc hcch hhhh hkcc hobo hoch hock hocr hoho hoko hook hoor horc hork horo horr hrob hrrc kbbb kbbc kbbk kbbo kbbr kbcb kbch kbck kbco kbcr kbhb kbhc kbhh kbhr kbkb kbkk kbko kbkr kbob kboc kbok kboo kbrb kbrc kbrh kbrk kbro kcbc kcbk kcbr kccb kccc kcck kccr kchh kchk kcho kchr kckc kckk kcko kckr kcob kcoh kcor kcrc kcrh kcro kcrr khbc khbr khcb khcc khch khck khhk khho khkk khkr khob khoc khok khor khrk khro khrr kkbb kkbo kkbr kkcb kkch kkck kkco kkcr kkhb kkhh kkhk kkhr kkkk kkob kkoh kkoo kkor kkrb kkrc kkrh kkrk kkro kkrr kobb kobc kobk kobo kobr kocb koch kock kohh koho kohr kokb kokc kokh kokk koko kokr koob kooc kook kooo koor korb korc kork koro korr krbb krbk krbr krcb krcc krch krco krhc krkc krkh krkk krko krkr krob kroc kroh krok kroo kror krrb krrc krrk krro krrr obbo obkb obok obor obrh obro ocbc occc ocro ocrr ohcc ohho ohob ohoh ohok okko okok okor okro oocr ooho oooh oooo orbb orbo orch orco orko oro- orok oror orro rbbb rbbr rboh rcbc rcbo rccb rccc rchb rhob rhoc rhoh rob- robb robo rocc roch rock roco rohr rokh rokk roko rokr roob rook roor rorc rork roro rrrr