-ol b-p bbb bbi bbl bbn bbo bbp bbs bi- bib bii bil bin bio bip bis blb bli bll bln blo blp bls bnb bni bnl bnn bno bnp bns bob boi bol bon boo bop bos bpb bpi bpl bpn bpo bpp bps bsb bsi bsl bsn bso bsp bss ibb ibi ibl ibn ibo ibp ibs iib iii iil iin iio iip iis il- ilb ili ill iln ilo ilp ils in- inb ini inl inn ino inp ins io- iob ioi iol ion ioo iop ios ipb ipi ipl ipn ipo ipp ips is- isb isi isl isn iso isp iss l-p lbb lbi lbl lbo lbp lbs lib lii lil lin lio lip lis llb lli lll lln llo llp lls lnb lni lnl lnn lno lnp lns lob loi lol lon loo lop los lpb lpi lpl lpn lpo lpp lps lsb lsi lsl lsn lso lsp lss n-i nbb nbi nbl nbn nbo nbp nbs nib nii nil nin nio nip nis nlb nli nll nln nlo nlp nls nnb nni nnl nnn nno nnp nns no- nob noi nol non noo nop nos npb npi npl npn npo npp nps nsb nsi nsl nsn nso nsp nss o-i ob- obb obi obl obn obo obp obs oib oii oil oin oio oip ois olb oli oll oln olo olp ols on- onb oni onl onn ono onp ons oo- oob ooi ool oon ooo oop oos op- opb opi opl opn opo opp ops os- osb osi osl osn oso osp oss p-p pbb pbi pbl pbn pbo pbp pbs pib pii pil pin pio pip pis plb pli pll pln plo plp pls pn- pnb pni pnl pnn pno pnp pns pob poi pol pon poo pop pos ppb ppi ppl ppn ppo ppp pps ps- psb psi psl psn pso psp pss sbb sbi sbl sbn sbo sbp sbs sib sii sil sin sio sip sis slb sli sll sln slo slp sls snb sni snl snn sno snp sns sob soi sol son soo sop sos spb spi spl spn spo spp sps ss- ssb ssi ssl ssn sso ssp sss