bbbb bbch bbrc bcbc bccc bcnu bcru bcuc bhcc bhur bhuu bnrr brcb brrr bruc bruh brun bubb bubu bucc buch bucu buhr bunb bunn bunu bur- burb burh burn burr buru cbbc cbcc cbcn cbcr cbcu cbrh cbrn ccbc ccbn cccb cccc cccu cchr ccnb ccnc ccnr ccnu ccrc ccuc chch chnb chnc chnr chrb chrc chrn chrr chub chun chur cnbc cnrc cnrr crbc crbu crcc crcr crub crun cub- cubb cucc cucn curb curn curr hcbc hccb hccc hcch hhhh hrrc hrun hubb huch hucu huhn huhu hunc hunh hurn hurr huru huub nbbc nbcc ncbc nccc nccn nccr nccu nchc ncnc ncrc nhcc nhnn nhrc nnnn nrrc nubc nuch nucu nunc nunn nurc nurn nurr nuru rbbb rbbr rcbc rccb rccc rchb rcnr rhun rnbr rrrr rrun rubb rubu ruch ruhh ruhn ruhr runc runn rurc ruru ruun ucbc ucrc uhuh uncc unch urch urrh urun urur uuuu