b-u bbb bbc bbh bbk bbn bbo bbr bbu bcb bcc bch bck bcn bco bcr bcu bhb bhc bhh bhk bho bhr bhu bkb bkc bkk bkn bko bkr bnb bnc bnk bnn bno bnr bnu bob boc boh bok bon boo bor bou brb brh brk brn bro brr bru bub buc buh buk bun buo bur buu c-- cbb cbc cbh cbk cbn cbo cbr cbu ccb ccc cch cck ccn cco ccr ccu ch- chb chc chh chk chn cho chr chu ckb ckc ckh cko cn- cnb cnc cnh cnn cno cnr cnu co- cob coc coh cok con coo cor cou crb crc crh crk crn cro crr cru cub cuc cuh cuk cun cuo cur cuu hbb hbc hbh hbk hbn hbo hbr hbu hcb hcc hch hck hcn hco hcr hhb hhc hhh hhk hhn hho hhr hhu hkb hkh hkk hkn hko hkr hku hnb hnc hnh hnk hnn hno hnu hob hoc hoh hok hon hoo hor hou hr- hrb hrc hrh hrk hrn hro hrr hru hub huc huh huk hun huo hur huu kbb kbc kbh kbk kbn kbo kbr kbu kcb kcc kch kck kcn kcr kcu khh khk khn kho khr khu kkb kkc kkh kkk kkn kkr kku kn- knc knk knn kno knr knu kob koc koh kok kon koo kor kou krc krk krn kro krr kru kub kuc kuh kuk kun kur kuu nbb nbc nbk nbn nbo nbr nbu ncb ncc nch nck ncn nco ncr ncu nhb nhc nhh nhk nhn nhr nhu nkc nkk nkn nko nkr nku nnb nnc nnh nnk nnn nno nnu no- nob noc noh nok non noo nor nou nrb nrc nrk nrn nro nrr nru nub nuc nuh nuk nun nuo nur nuu ob- obb obc obh obk obn obo obr obu oc- ocb occ och ock ocn oco ocr ocu ohc ohh ohn oho ohr ohu okb okc okk oko okr oku on- onb onc onh onk onn ono onr onu oo- oob ooc ooh ook oon ooo oor or- orb orc orh ork orn oro orr oru ou- ouc ouh ouk oun ouo our rbb rbc rbh rbk rbn rbo rbr rbu rcb rcc rch rcn rco rcr rcu rh- rhb rhc rhh rhn rho rhr rhu rkb rkc rkk rko rku rnb rnc rnh rnn rno rnr rnu rob roc roh rok ron roo ror rou rrb rrc rrh rrk rrn rrr rru rub ruc ruh ruk run ruo rur ruu ubb ubc ubh ubk ubn ubo ubr ubu ucb ucc uch uck ucn uco ucr ucu uhb uhc uhh uho uhr uhu ukb ukc ukk ukn ukr uku un- unb unc unh unk unn uno unr unu uob uoc uok uon uoo uor ur- urb urc urk urn uro urr uru uuc uun uur uuu