-ol b-p bbb bbi bbl bbo bbp bbs bbt bi- bib bii bil bio bip bis bit blb bli bll blo blp bls blt bob boi bol boo bop bos bot bpb bpi bpl bpo bpp bps bpt bsb bsi bsl bso bsp bss bst btb bti btl bto btp bts btt ibb ibi ibl ibo ibp ibs ibt iib iii iil iio iip iis iit il- ilb ili ill ilo ilp ils ilt io- iob ioi iol ioo iop ios iot ipb ipi ipl ipo ipp ips ipt is- isb isi isl iso isp iss ist itb iti itl ito itp its itt l-p lbb lbi lbl lbo lbp lbs lbt lib lii lil lio lip lis lit llb lli lll llo llp lls llt lob loi lol loo lop los lot lpb lpi lpl lpo lpp lps lpt lsb lsi lsl lso lsp lss lst ltb lti ltl lto ltp lts ltt o-i ob- obb obi obl obo obp obs obt oib oii oil oio oip ois oit olb oli oll olo olp ols olt oo- oob ooi ool ooo oop oos oot op- opb opi opl opo opp ops opt os- osb osi osl oso osp oss ost ot- otb oti otl oto otp ots ott p-p pbb pbi pbl pbo pbp pbs pbt pib pii pil pio pip pis pit plb pli pll plo plp pls plt pob poi pol poo pop pos pot ppb ppi ppl ppo ppp pps ppt ps- psb psi psl pso psp pss pst pt- ptb pti ptl pto ptp pts ptt sbb sbi sbl sbo sbp sbs sbt sib sii sil sio sip sis sit slb sli sll slo slp sls slt sob soi sol soo sop sos sot spb spi spl spo spp sps spt ss- ssb ssi ssl sso ssp sss sst stb sti stl sto stp sts stt tbb tbi tbl tbo tbp tbs tbt tib tii til tio tip tis tit tli tll tlo tlp tls tlt to- tob toi tol too top tos tot tpb tpi tpl tpo tpp tps tpt tsb tsi tsl tso tsp tss tst ttb tti ttl tto ttp tts ttt