b-u bbb bbc bbd bbh bbn bbo bbu bcb bcc bcd bch bcn bco bcu bdb bdc bdd bdh bdo bdu bhb bhc bhd bhh bho bhu bnb bnc bnd bnn bno bnu bob boc bod boh bon boo bou bub buc bud buh bun buo buu c-- cbb cbc cbd cbh cbn cbo cbu ccb ccc ccd cch ccn cco ccu cdb cdc cdd cdh cdn cdo cdu ch- chb chc chd chh chn cho chu cn- cnb cnc cnd cnh cnn cno cnu co- cob coc cod coh con coo cou cub cuc cud cuh cun cuo cuu dbb dbc dbd dbh dbn dbo dbu dcb dcc dcd dcn dco dcu ddb ddc ddd ddh ddn ddo ddu dh- dhb dhc dhd dhh dho dhu dnb dnc dnd dnh dnn dno dob doc dod doh don doo dou dub duc dud duh dun duo hbb hbc hbd hbh hbn hbo hbu hcb hcc hcd hch hcn hco hdb hdc hdd hdh hdn hdo hdu hhb hhc hhd hhh hhn hho hhu hnb hnc hnd hnh hnn hno hnu hob hoc hod hoh hon hoo hou hub huc hud huh hun huo huu nbb nbc nbd nbn nbo nbu ncb ncc ncd nch ncn nco ncu ndb ndc ndd ndh ndn ndo ndu nhb nhc nhd nhh nhn nhu nnb nnc nnh nnn nno nnu no- nob noc nod noh non noo nou nub nuc nud nuh nun nuo nuu ob- obb obc obd obh obn obo obu oc- ocb occ ocd och ocn oco ocu odb odc odd odh odn odo odu ohc ohd ohh ohn oho ohu on- onb onc ond onh onn ono onu oo- oob ooc ood ooh oon ooo ou- ouc oud ouh oun ouo ubb ubc ubh ubn ubo ubu ucb ucc ucd uch ucn uco ucu udb udc udd udn udo udu uhb uhc uhd uhh uho uhu un- unb unc und unh unn uno unu uob uoc uod uon uoo uuc uun uuu