bbb bbe bbm bbo bbt be- beb bee bem beo bet bmb bme bmm bmo bmt bob boe bom boo bot btb bte btm bto btt ebb ebe ebm ebo ebt eeb eee eem eeo eet em- emb eme emm emo emt eo- eob eoe eom eoo eot etb ete etm eto ett m-o mbb mbe mbm mbo mbt meb mee mem meo met mmb mme mmm mmo mmt mob moe mom moo mot mtb mte mtm mto mtt ob- obb obe obm obo obt oeb oee oem oeo oet om- omb ome omm omo omt oo- oob oom ooo oot ot- otb ote otm oto ott tbb tbe tbm tbo tbt te- teb tee tem teo tet tmb tme tmm tmo tmt to- tob toe tom too tot ttb tte ttm tto ttt