bbb bbe bbm bbn bbo bbx be- beb bee bem ben beo bex bmb bme bmm bmn bmo bmx bnb bne bnn bno bnx bob boe bom bon boo box bxb bxm bxn bxo bxx ebb ebe ebm ebn ebo ebx eeb eee eem een eeo eex em- emb eme emm emn emo emx en- enb ene enm enn eno eo- eob eoe eom eon eoo ex- exe exo exx m-o mbb mbe mbm mbo mbx meb mee mem men meo mex mmb mme mmm mmn mmo mmx mnb mne mnm mnn mno mob moe mom mon moo mox mxn nbb nbe nbm nbn nbo nbx ne- neb nee nem nen neo nex nmb nme nmm nmn nmo nnb nne nnm nnn nno no- nob noe nom non noo nox ob- obb obe obm obn obo obx oeb oee oem oen oeo oex om- omb ome omm omn omo omx on- onb one onn ono onx oo- oob oom oon ooo oox ox- oxb oxn oxo oxx xbe xbx xee xem xen xex xmm xmo xmx xno xom xon xoo xox xxo xxx