b-u bbb bbc bbd bbh bbk bbn bbo bbu bcb bcc bcd bch bck bcn bco bcu bdb bdc bdd bdh bdk bdo bdu bhb bhc bhd bhh bhk bho bhu bkb bkc bkk bkn bko bnb bnc bnd bnk bnn bno bnu bob boc bod boh bok bon boo bou bub buc bud buh buk bun buo buu c-- cbb cbc cbd cbh cbk cbn cbo cbu ccb ccc ccd cch cck ccn cco ccu cdb cdc cdd cdh cdk cdn cdo cdu ch- chb chc chd chh chk chn cho chu ckb ckc ckd ckh cko cn- cnb cnc cnd cnh cnn cno cnu co- cob coc cod coh cok con coo cou cub cuc cud cuh cuk cun cuo cuu dbb dbc dbd dbh dbk dbn dbo dbu dcb dcc dcd dck dcn dco dcu ddb ddc ddd ddh ddk ddn ddo ddu dh- dhb dhc dhd dhh dhk dho dhu dkb dkc dkk dko dku dnb dnc dnd dnh dnk dnn dno dob doc dod doh dok don doo dou dub duc dud duh duk dun duo hbb hbc hbd hbh hbk hbn hbo hbu hcb hcc hcd hch hck hcn hco hdb hdc hdd hdh hdk hdn hdo hdu hhb hhc hhd hhh hhk hhn hho hhu hkb hkd hkh hkk hkn hko hku hnb hnc hnd hnh hnk hnn hno hnu hob hoc hod hoh hok hon hoo hou hub huc hud huh huk hun huo huu kbb kbc kbd kbh kbk kbn kbo kbu kcb kcc kcd kch kck kcn kcu kdb kdc kdh kdk kdo kdu khh khk khn kho khu kkb kkc kkh kkk kkn kku kn- knc knd knk knn kno knu kob koc kod koh kok kon koo kou kub kuc kud kuh kuk kun kuu nbb nbc nbd nbk nbn nbo nbu ncb ncc ncd nch nck ncn nco ncu ndb ndc ndd ndh ndk ndn ndo ndu nhb nhc nhd nhh nhk nhn nhu nkc nkk nkn nko nku nnb nnc nnh nnk nnn nno nnu no- nob noc nod noh nok non noo nou nub nuc nud nuh nuk nun nuo nuu ob- obb obc obd obh obk obn obo obu oc- ocb occ ocd och ock ocn oco ocu odb odc odd odh odn odo odu ohc ohd ohh ohn oho ohu okb okc okd okk oko oku on- onb onc ond onh onk onn ono onu oo- oob ooc ood ooh ook oon ooo ou- ouc oud ouh ouk oun ouo ubb ubc ubh ubk ubn ubo ubu ucb ucc ucd uch uck ucn uco ucu udb udc udd udk udn udo udu uhb uhc uhd uhh uho uhu ukb ukc ukk ukn uku un- unb unc und unh unk unn uno unu uob uoc uod uok uon uoo uuc uun uuu