-ol bbb bbe bbl bbm bbo bbs bbx be- beb bee bel bem beo bes bex blb ble bll blm blo bls blx bmb bme bml bmm bmo bms bmx bob boe bol bom boo bos box bsb bse bsl bsm bso bss bsx bxb bxl bxm bxo bxx ebb ebe ebl ebm ebo ebs ebx eeb eee eel eem eeo ees eex elb ele ell elm elo els elx em- emb eme eml emm emo ems emx eo- eob eoe eol eom eoo eos es- esb ese esl esm eso ess esx ex- exe exl exo exs exx lbb lbe lbl lbm lbo lbs lbx leb lee lel lem leo les lex llb lle lll llm llo lls lmb lme lml lmm lmo lms lob loe lol lom loo los lox lsb lse lsl lsm lso lss lxo lxx m-o mbb mbe mbl mbm mbo mbs mbx meb mee mel mem meo mes mex mlb mle mll mlm mlo mls mlx mmb mme mml mmm mmo mms mmx mob moe mol mom moo mos mox msb mse msl msm mso mss msx mxl mxs ob- obb obe obl obm obo obs obx oeb oee oel oem oeo oes oex olb ole oll olm olo ols om- omb ome oml omm omo oms omx oo- oob ool oom ooo oos oox os- osb ose osl osm oso oss osx ox- oxb oxo oxx sbb sbe sbl sbm sbo sbs sbx se- seb see sel sem seo ses sex slb sle sll slm slo sls slx smb sme sml smm smo sms smx sob soe sol som soo sos sox ss- ssb sse ssl ssm sso sss ssx sxl sxm sxs xbe xbl xbx xee xel xem xes xex xlb xlm xls xml xmm xmo xms xmx xom xoo xos xox xsb xsl xsm xss xxl xxo xxx