b-u bbb bbe bbo bbs bbt bbu bbx be- beb bee beo bes bet beu bex bob boe boo bos bot bou box bsb bse bso bss bst bsu bsx btb bte bto bts btt btu btx bub bue buo bus but buu bux bxb bxo bxx ebb ebe ebo ebs ebt ebu ebx eeb eee eeo ees eet eex eo- eob eoe eoo eos eot eou es- esb ese eso ess est esu esx etb ete eto ets ett etu etx eu- eub eue eus eut eux ex- exe exo exs ext exu exx ob- obb obe obo obs obt obu obx oeb oee oeo oes oet oex oo- oob ooo oos oot oox os- osb ose oso oss ost osu osx ot- otb ote oto ots ott otu ou- oue ouo ous out ox- oxb oxo oxt oxx sbb sbe sbo sbs sbt sbu sbx se- seb see seo ses set seu sex sob soe soo sos sot sou sox ss- ssb sse sso sss sst ssu ssx stb ste sto sts stt stu stx sub sue suo sus sut suu sux sxs sxt sxu t-x tbb tbe tbo tbs tbt tbu te- teb tee teo tes tet teu tex to- tob toe too tos tot tou tox tsb tse tso tss tst tsu tsx ttb tte tto tts ttt ttu ttx tub tue tuo tus tut tuu tux txe txs txt txu ubb ube ubo ubs ubt ubu ubx ueb uee ues uet uob uoe uoo uos uot uox usb use uso uss ust usu usx utb ute uto uts utt utu utx uue uus uut uuu uxb uxo uxt uxu xbe xbx xee xes xet xeu xex xoo xos xot xox xsb xss xst xts xtx xue xus xxo xxx