bbb bbe bbm bbo bbs be- beb bee bem beo bes bmb bme bmm bmo bms bob boe bom boo bos bsb bse bsm bso bss ebb ebe ebm ebo ebs eeb eee eem eeo ees em- emb eme emm emo ems eo- eob eoe eom eoo eos es- esb ese esm eso ess m-o mbb mbe mbm mbo mbs meb mee mem meo mes mmb mme mmm mmo mms mob moe mom moo mos msb mse msm mso mss ob- obb obe obm obo obs oeb oee oem oeo oes om- omb ome omm omo oms oo- oob oom ooo oos os- osb ose osm oso oss sbb sbe sbm sbo sbs se- seb see sem seo ses smb sme smm smo sms sob soe som soo sos ss- ssb sse ssm sso sss