bbb bbe bbm bbo bbs bbt be- beb bee bem beo bes bet bmb bme bmm bmo bms bmt bob boe bom boo bos bot bsb bse bsm bso bss bst btb bte btm bto bts btt ebb ebe ebm ebo ebs ebt eeb eee eem eeo ees eet em- emb eme emm emo ems emt eo- eob eoe eom eoo eos eot es- esb ese esm eso ess est etb ete etm eto ets ett m-o mbb mbe mbm mbo mbs mbt meb mee mem meo mes met mmb mme mmm mmo mms mmt mob moe mom moo mos mot msb mse msm mso mss mst mtb mte mtm mto mts mtt ob- obb obe obm obo obs obt oeb oee oem oeo oes oet om- omb ome omm omo oms omt oo- oob oom ooo oos oot os- osb ose osm oso oss ost ot- otb ote otm oto ots ott sbb sbe sbm sbo sbs sbt se- seb see sem seo ses set smb sme smm smo sms smt sob soe som soo sos sot ss- ssb sse ssm sso sss sst stb ste stm sto sts stt tbb tbe tbm tbo tbs tbt te- teb tee tem teo tes tet tmb tme tmm tmo tms tmt to- tob toe tom too tos tot tsb tse tsm tso tss tst ttb tte ttm tto tts ttt