-ol b-p bbb bbi bbl bbo bbp bbr bbs bi- bib bii bil bio bip bir bis blb bli bll blo blp blr bls bob boi bol boo bop bor bos bpb bpi bpl bpo bpp bpr bps brb bri brl bro brp brr brs bsb bsi bsl bso bsp bsr bss ibb ibi ibl ibo ibp ibr ibs iib iii iil iio iip iir iis il- ilb ili ill ilo ilp ilr ils io- iob ioi iol ioo iop ior ios ipb ipi ipl ipo ipp ipr ips ir- irb iri irl iro irp irr irs is- isb isi isl iso isp isr iss l-p lbb lbi lbl lbo lbp lbr lbs lib lii lil lio lip lir lis llb lli lll llo llp llr lls lob loi lol loo lop lor los lpb lpi lpl lpo lpp lpr lps lrb lri lro lrp lrr lrs lsb lsi lsl lso lsp lsr lss o-i ob- obb obi obl obo obp obr obs oib oii oil oio oip oir ois olb oli oll olo olp ols oo- oob ooi ool ooo oop oor oos op- opb opi opl opo opp opr ops or- orb ori orl oro orp orr ors os- osb osi osl oso osp osr oss p-p pbb pbi pbl pbo pbp pbr pbs pib pii pil pio pip pir pis plb pli pll plo plp plr pls pob poi pol poo pop por pos ppb ppi ppl ppo ppp ppr pps prb pri prl pro prp prr prs ps- psb psi psl pso psp psr pss rbb rbi rbl rbo rbp rbr rbs rib rii ril rio rip rir ris rli rll rlo rlp rlr rls rob roi rol roo rop ror ros rpb rpi rpl rpo rpp rpr rps rrb rri rrl rrp rrr rrs rsb rsi rsl rso rsp rsr rss sbb sbi sbl sbo sbp sbr sbs sib sii sil sio sip sir sis slb sli sll slo slp slr sls sob soi sol soo sop sor sos spb spi spl spo spp spr sps sr- srb sri srl sro srp srr srs ss- ssb ssi ssl sso ssp ssr sss