-ol bbb bbd bbl bbn bbo bbs bbt bdb bdd bdl bdo bds bdt blb bld bll bln blo bls blt bnb bnd bnl bnn bno bns bnt bob bod bol bon boo bos bot bsb bsd bsl bsn bso bss bst btb btd btl btn bto bts btt dbb dbd dbl dbn dbo dbs dbt ddb ddd ddl ddn ddo dds ddt dl- dlb dld dll dlo dls dlt dnb dnd dnl dnn dno dns dnt dob dod dol don doo dos dot dsb dsd dsl dsn dso dss dst dtb dtd dtl dtn dto dts dtt lbb lbd lbl lbo lbs lbt ldb ldd ldl ldn ldo lds ldt llb lld lll lln llo lls llt lnb lnd lnl lnn lno lns lnt lob lod lol lon loo los lot lsb lsd lsl lsn lso lss lst ltb ltd ltl lto lts ltt nbb nbd nbl nbn nbo nbs nbt ndb ndd ndl ndn ndo nds ndt nlb nld nll nln nlo nls nlt nnb nnl nnn nno nns nnt no- nob nod nol non noo nos not nsb nsd nsl nsn nso nss nst ntb ntd ntn nto nts ntt ob- obb obd obl obn obo obs obt odb odd odl odn odo ods odt olb old oll oln olo ols olt on- onb ond onl onn ono ons ont oo- oob ood ool oon ooo oos oot os- osb osd osl osn oso oss ost ot- otb otd otl otn oto ots ott sbb sbd sbl sbn sbo sbs sbt sdb sdd sdl sdn sdo sds sdt slb sld sll sln slo sls slt snb snd snl snn sno sns snt sob sod sol son soo sos sot ss- ssb ssd ssl ssn sso sss sst stb std stl stn sto sts stt tbb tbd tbl tbn tbo tbs tbt tdb tdd tdl tdn tdo tds tdt tld tll tln tlo tls tlt tnb tnd tnl tnn tno tns tnt to- tob tod tol ton too tos tot tsb tsd tsl tsn tso tss tst ttb ttd ttl ttn tto tts ttt