-ol bbb bbd bbl bbo bbs bdb bdd bdl bdo bds blb bld bll blo bls bob bod bol boo bos bsb bsd bsl bso bss dbb dbd dbl dbo dbs ddb ddd ddl ddo dds dl- dlb dld dll dlo dls dob dod dol doo dos dsb dsd dsl dso dss lbb lbd lbl lbo lbs ldb ldd ldl ldo lds llb lld lll llo lls lob lod lol loo los lsb lsd lsl lso lss ob- obb obd obl obo obs odb odd odl odo ods olb old oll olo ols oo- oob ood ool ooo oos os- osb osd osl oso oss sbb sbd sbl sbo sbs sdb sdd sdl sdo sds slb sld sll slo sls sob sod sol soo sos ss- ssb ssd ssl sso sss