bbb bbd bbe bbo bbs bbt bbx bdb bdd bde bdo bds bdt bdx be- beb bed bee beo bes bet bex bob bod boe boo bos bot box bsb bsd bse bso bss bst bsx btb btd bte bto bts btt btx bxb bxd bxo bxx dbb dbd dbe dbo dbs dbt dbx ddb ddd dde ddo dds ddt ddx de- deb ded dee deo des det dex dob dod doe doo dos dot dox dsb dsd dse dso dss dst dsx dtb dtd dte dto dts dtt dtx dxd dxo dxs dxt dxx ebb ebd ebe ebo ebs ebt ebx ed- edb edd ede edo eds edt edx eeb eed eee eeo ees eet eex eo- eob eod eoe eoo eos eot es- esb esd ese eso ess est esx etb etd ete eto ets ett etx ex- exd exe exo exs ext exx ob- obb obd obe obo obs obt obx odb odd ode odo ods odt oeb oed oee oeo oes oet oex oo- oob ood ooo oos oot oox os- osb osd ose oso oss ost osx ot- otb otd ote oto ots ott ox- oxb oxo oxt oxx sbb sbd sbe sbo sbs sbt sbx sdb sdd sde sdo sds sdt se- seb sed see seo ses set sex sob sod soe soo sos sot sox ss- ssb ssd sse sso sss sst ssx stb std ste sto sts stt stx sxs sxt t-x tbb tbd tbe tbo tbs tbt tdb tdd tde tdo tds tdt tdx te- teb ted tee teo tes tet tex to- tob tod toe too tos tot tox tsb tsd tse tso tss tst tsx ttb ttd tte tto tts ttt ttx txe txs txt xbe xbx xdb xde xds xdt xed xee xes xet xex xod xoo xos xot xox xsb xss xst xts xtx xxo xxx