bbb bbe bbm bbo bbs bbx be- beb bee bem beo bes bex bmb bme bmm bmo bms bmx bob boe bom boo bos box bsb bse bsm bso bss bsx bxb bxm bxo bxx ebb ebe ebm ebo ebs ebx eeb eee eem eeo ees eex em- emb eme emm emo ems emx eo- eob eoe eom eoo eos es- esb ese esm eso ess esx ex- exe exo exs exx m-o mbb mbe mbm mbo mbs mbx meb mee mem meo mes mex mmb mme mmm mmo mms mmx mob moe mom moo mos mox msb mse msm mso mss msx mxs ob- obb obe obm obo obs obx oeb oee oem oeo oes oex om- omb ome omm omo oms omx oo- oob oom ooo oos oox os- osb ose osm oso oss osx ox- oxb oxo oxx sbb sbe sbm sbo sbs sbx se- seb see sem seo ses sex smb sme smm smo sms smx sob soe som soo sos sox ss- ssb sse ssm sso sss ssx sxm sxs xbe xbx xee xem xes xex xmm xmo xms xmx xom xoo xos xox xsb xsm xss xxo xxx