-ol bbb bbl bbo bbr bbs bbw blb bll blo blr bls bob bol boo bor bos bow brb brl bro brr brs brw bsb bsl bso bsr bss bsw bwb bwl bwo bwr bws lbb lbl lbo lbr lbs lbw llb lll llo llr lls llw lob lol loo lor los low lrb lro lrr lrs lrw lsb lsl lso lsr lss lsw lwb lwl lwo lwr lws lww ob- obb obl obo obr obs obw olb oll olo ols olw oo- oob ool ooo oor oos oow or- orb orl oro orr ors os- osb osl oso osr oss osw owb owl owo ows oww rbb rbl rbo rbr rbs rbw rll rlo rlr rls rlw rob rol roo ror ros row rrb rrl rrr rrs rsb rsl rso rsr rss rsw rwb rwl rwr rws sbb sbl sbo sbr sbs sbw slb sll slo slr sls sob sol soo sor sos sow sr- srb srl sro srr srs srw ss- ssb ssl sso ssr sss ssw swb swl swo swr sws wbb wbo wbr wbs wbw wl- wlb wll wlo wlr wls wlw wob wol woo wor wos wow wr- wrl wro wrr wrs wrw wsb wsl wso wsr wss wsw wwl wwo www