-ol b-p bbb bbl bbn bbo bbp bbr blb bll bln blo blp blr bnb bnl bnn bno bnp bnr bob bol bon boo bop bor bpb bpl bpn bpo bpp bpr brb brl brn bro brp brr l-p lbb lbl lbo lbp lbr llb lll lln llo llp llr lnb lnl lnn lno lnp lnr lob lol lon loo lop lor lpb lpl lpn lpo lpp lpr lrb lrn lro lrp lrr nbb nbl nbn nbo nbp nbr nlb nll nln nlo nlp nlr nnb nnl nnn nno nnp no- nob nol non noo nop nor npb npl npn npo npp npr nrb nrl nrn nro nrp nrr ob- obb obl obn obo obp obr olb oll oln olo olp on- onb onl onn ono onp onr oo- oob ool oon ooo oop oor op- opb opl opn opo opp opr or- orb orl orn oro orp orr p-p pbb pbl pbn pbo pbp pbr plb pll pln plo plp plr pn- pnb pnl pnn pno pnp pnr pob pol pon poo pop por ppb ppl ppn ppo ppp ppr prb prl prn pro prp prr rbb rbl rbn rbo rbp rbr rll rln rlo rlp rlr rnb rnn rno rnp rnr rob rol ron roo rop ror rpb rpl rpn rpo rpp rpr rrb rrl rrn rrp rrr