-ol b-p bbb bbl bbo bbp bbs bbt blb bll blo blp bls blt bob bol boo bop bos bot bpb bpl bpo bpp bps bpt bsb bsl bso bsp bss bst btb btl bto btp bts btt l-p lbb lbl lbo lbp lbs lbt llb lll llo llp lls llt lob lol loo lop los lot lpb lpl lpo lpp lps lpt lsb lsl lso lsp lss lst ltb ltl lto ltp lts ltt ob- obb obl obo obp obs obt olb oll olo olp ols olt oo- oob ool ooo oop oos oot op- opb opl opo opp ops opt os- osb osl oso osp oss ost ot- otb otl oto otp ots ott p-p pbb pbl pbo pbp pbs pbt plb pll plo plp pls plt pob pol poo pop pos pot ppb ppl ppo ppp pps ppt ps- psb psl pso psp pss pst pt- ptb ptl pto ptp pts ptt sbb sbl sbo sbp sbs sbt slb sll slo slp sls slt sob sol soo sop sos sot spb spl spo spp sps spt ss- ssb ssl sso ssp sss sst stb stl sto stp sts stt tbb tbl tbo tbp tbs tbt tll tlo tlp tls tlt to- tob tol too top tos tot tpb tpl tpo tpp tps tpt tsb tsl tso tsp tss tst ttb ttl tto ttp tts ttt