-ol b-u bbb bbc bbd bbl bbo bbu bcb bcc bcd bcl bco bcu bdb bdc bdd bdl bdo bdu blb blc bld bll blo blu bob boc bod bol boo bou bub buc bud bul buo buu c-- cbb cbc cbd cbl cbo cbu ccb ccc ccd ccl cco ccu cdb cdc cdd cdl cdo cdu cl- clb clc cld cll clo clu co- cob coc cod col coo cou cub cuc cud cul cuo cuu dbb dbc dbd dbl dbo dbu dcb dcc dcd dcl dco dcu ddb ddc ddd ddl ddo ddu dl- dlb dlc dld dll dlo dlu dob doc dod dol doo dou dub duc dud dul duo lbb lbc lbd lbl lbo lbu lcb lcc lcd lcl lco lcu ldb ldc ldd ldl ldo ldu llb llc lld lll llo llu lob loc lod lol loo lou lub luc lud lul luo luu ob- obb obc obd obl obo obu oc- ocb occ ocd ocl oco ocu odb odc odd odl odo odu olb olc old oll olo olu oo- oob ooc ood ool ooo ou- ouc oud oul ouo ubb ubc ubl ubo ubu ucb ucc ucd ucl uco ucu udb udc udd udl udo udu ulb ulc uld ull ulo ulu uob uoc uod uol uoo uuc uuu