bbb bbi bbl bbn bbs bi- bib bii bil bin bis blb bli bll bln bls bnb bni bnl bnn bns bsb bsi bsl bsn bss ibb ibi ibl ibn ibs iib iii iil iin iis il- ilb ili ill iln ils in- inb ini inl inn ins is- isb isi isl isn iss lbb lbi lbl lbs lib lii lil lin lis llb lli lll lln lls lnb lni lnl lnn lns lsb lsi lsl lsn lss n-i nbb nbi nbl nbn nbs nib nii nil nin nis nlb nli nll nln nls nnb nni nnl nnn nns nsb nsi nsl nsn nss sbb sbi sbl sbn sbs sib sii sil sin sis slb sli sll sln sls snb sni snl snn sns ss- ssb ssi ssl ssn sss