-ol b-p bbb bbl bbo bbp bbs blb bll blo blp bls bob bol boo bop bos bpb bpl bpo bpp bps bsb bsl bso bsp bss l-p lbb lbl lbo lbp lbs llb lll llo llp lls lob lol loo lop los lpb lpl lpo lpp lps lsb lsl lso lsp lss ob- obb obl obo obp obs olb oll olo olp ols oo- oob ool ooo oop oos op- opb opl opo opp ops os- osb osl oso osp oss p-p pbb pbl pbo pbp pbs plb pll plo plp pls pob pol poo pop pos ppb ppl ppo ppp pps ps- psb psl pso psp pss sbb sbl sbo sbp sbs slb sll slo slp sls sob sol soo sop sos spb spl spo spp sps ss- ssb ssl sso ssp sss