b-u bbb bbc bbd bbg bbo bbr bbu bcb bcc bcd bcg bco bcr bcu bdb bdc bdd bdg bdo bdr bdu bgb bgc bgd bgg bgo bgr bgu bob boc bod bog boo bor bou brb brd brg bro brr bru bub buc bud bug buo bur buu c-- cbb cbc cbd cbg cbo cbr cbu ccb ccc ccd ccg cco ccr ccu cdb cdc cdd cdg cdo cdr cdu cgb cgc cgd cgg cgo cgr cgu co- cob coc cod cog coo cor cou crb crc crd crg cro crr cru cub cuc cud cug cuo cur cuu dbb dbc dbd dbg dbo dbr dbu dcb dcc dcd dcg dco dcr dcu ddb ddc ddd ddg ddo ddr ddu dgc dgd dgg dgr dgu dob doc dod dog doo dor dou drb drc drd drg dro drr dru dub duc dud dug duo dur g-d gbc gbd gbg gbo gbr gbu gcb gcc gcd gcg gco gcr gcu gdb gdc gdd gdo gdr gdu ggb ggc ggd ggg ggo ggr ggu gob goc god gog goo gor gou grb grc grd grg gro grr gru gu- gub guc gud gug guo gur guu ob- obb obc obd obg obo obr obu oc- ocb occ ocd ocg oco ocr ocu odb odc odd odg odo odr odu ogc ogd ogg ogo oo- oob ooc ood oog ooo oor or- orb orc ord org oro orr oru ou- ouc oud ouo our rbb rbc rbd rbg rbo rbr rbu rcb rcc rcd rcg rco rcr rcu rdb rdc rdd rdg rdo rdr rdu rgb rgc rgd rgg rgo rgr rob roc rod rog roo ror rou rrb rrc rrd rrg rrr rru rub ruc rud rug ruo rur ruu ubb ubc ubg ubo ubr ubu ucb ucc ucd ucg uco ucr ucu udb udc udd udg udo udr udu ugb ugc ugg ugo ugr ugu uob uoc uod uog uoo uor ur- urb urc urd urg uro urr uru uuc uug uur uuu