-ol bbb bbl bbn bbo bbs blb bll bln blo bls bnb bnl bnn bno bns bob bol bon boo bos bsb bsl bsn bso bss lbb lbl lbo lbs llb lll lln llo lls lnb lnl lnn lno lns lob lol lon loo los lsb lsl lsn lso lss nbb nbl nbn nbo nbs nlb nll nln nlo nls nnb nnl nnn nno nns no- nob nol non noo nos nsb nsl nsn nso nss ob- obb obl obn obo obs olb oll oln olo ols on- onb onl onn ono ons oo- oob ool oon ooo oos os- osb osl osn oso oss sbb sbl sbn sbo sbs slb sll sln slo sls snb snl snn sno sns sob sol son soo sos ss- ssb ssl ssn sso sss