bbb bbd bbe bbo bbt bbx bdb bdd bde bdo bdt bdx be- beb bed bee beo bet bex bob bod boe boo bot box btb btd bte bto btt btx bxb bxd bxo bxx dbb dbd dbe dbo dbt dbx ddb ddd dde ddo ddt ddx de- deb ded dee deo det dex dob dod doe doo dot dox dtb dtd dte dto dtt dtx dxd dxo dxt dxx ebb ebd ebe ebo ebt ebx ed- edb edd ede edo edt edx eeb eed eee eeo eet eex eo- eob eod eoe eoo eot etb etd ete eto ett etx ex- exd exe exo ext exx ob- obb obd obe obo obt obx odb odd ode odo odt oeb oed oee oeo oet oex oo- oob ood ooo oot oox ot- otb otd ote oto ott ox- oxb oxo oxt oxx t-x tbb tbd tbe tbo tbt tdb tdd tde tdo tdt tdx te- teb ted tee teo tet tex to- tob tod toe too tot tox ttb ttd tte tto ttt ttx txe txt xbe xbx xdb xde xdt xed xee xet xex xod xoo xot xox xtx xxo xxx