b-u bbb bbe bbm bbo bbs bbt bbu bbx be- beb bee bem beo bes bet beu bex bmb bme bmm bmo bms bmt bmu bmx bob boe bom boo bos bot bou box bsb bse bsm bso bss bst bsu bsx btb bte btm bto bts btt btu btx bub bue bum buo bus but buu bux bxb bxm bxo bxx ebb ebe ebm ebo ebs ebt ebu ebx eeb eee eem eeo ees eet eex em- emb eme emm emo ems emt emu emx eo- eob eoe eom eoo eos eot eou es- esb ese esm eso ess est esu esx etb ete etm eto ets ett etu etx eu- eub eue eus eut eux ex- exe exo exs ext exu exx m-o mbb mbe mbm mbo mbs mbt mbu mbx meb mee mem meo mes met meu mex mmb mme mmm mmo mms mmt mmu mmx mob moe mom moo mos mot mou mox msb mse msm mso mss mst msu msx mtb mte mtm mto mts mtt mtu mtx mub mue mum mus mut muu mux mxs mxu ob- obb obe obm obo obs obt obu obx oeb oee oem oeo oes oet oex om- omb ome omm omo oms omt omu omx oo- oob oom ooo oos oot oox os- osb ose osm oso oss ost osu osx ot- otb ote otm oto ots ott otu ou- oue oum ouo ous out ox- oxb oxo oxt oxx sbb sbe sbm sbo sbs sbt sbu sbx se- seb see sem seo ses set seu sex smb sme smm smo sms smt smu smx sob soe som soo sos sot sou sox ss- ssb sse ssm sso sss sst ssu ssx stb ste stm sto sts stt stu stx sub sue sum suo sus sut suu sux sxm sxs sxt sxu t-x tbb tbe tbm tbo tbs tbt tbu te- teb tee tem teo tes tet teu tex tmb tme tmm tmo tms tmt tmu tmx to- tob toe tom too tos tot tou tox tsb tse tsm tso tss tst tsu tsx ttb tte ttm tto tts ttt ttu ttx tub tue tum tuo tus tut tuu tux txe txs txt txu ubb ube ubo ubs ubt ubu ubx ueb uee uem ues uet um- umb ume umm umo ums umt umu uob uoe uom uoo uos uot uox usb use usm uso uss ust usu usx utb ute utm uto uts utt utu utx uue uum uus uut uuu uxb uxo uxt uxu xbe xbx xee xem xes xet xeu xex xmm xmo xms xmt xmu xmx xom xoo xos xot xox xsb xsm xss xst xtm xts xtx xue xus xxo xxx