bbb bbe bbm bbo bbx be- beb bee bem beo bex bmb bme bmm bmo bmx bob boe bom boo box bxb bxm bxo bxx ebb ebe ebm ebo ebx eeb eee eem eeo eex em- emb eme emm emo emx eo- eob eoe eom eoo ex- exe exo exx m-o mbb mbe mbm mbo mbx meb mee mem meo mex mmb mme mmm mmo mmx mob moe mom moo mox ob- obb obe obm obo obx oeb oee oem oeo oex om- omb ome omm omo omx oo- oob oom ooo oox ox- oxb oxo oxx xbe xbx xee xem xex xmm xmo xmx xom xoo xox xxo xxx