bbbb bcbc bccc bcnu bcuc bubb bubu bucc buck bucu bukk buku bunb bunk bunn bunu cbbc cbcc cbcn cbcu cbkn ccbc ccbn cccb cccc cccu ccnb ccnc ccnu ccuc ckbc ckck cknb cknc cnbc cub- cubb cucc cuck cucn cuk- kbbb kbbc kbbk kbbu kbcb kbck kbcu kbkb kbkk kbnn kbnu kbub kbuc kbuk kbun kbuu kcbc kcbk kcbu kccb kccc kcck kccu kckc kckk kckn kcnb kcub kcuk kkbb kkbn kkcb kkck kkcn kkkk kknb kknn kknu kkuu knbb knbc knbn knbu kncb knck kncn kncu knkk knnb knnk knub knuk kubb kubc kubu kucb kucc kukk kukn kuku kunc kunk kunu kuub kuuk kuuu nbbc nbcc ncbc nccc nccn nccu ncnc ncuk nnnn nubc nubk nuck nucu nuku nunc nunk nunn nuuk ucbc ukcc uknc uncc unkn uuuu