-ol bbb bbd bbe bbl bbo bbt bbx bdb bdd bde bdl bdo bdt bdx be- beb bed bee bel beo bet bex blb bld ble bll blo blt blx bob bod boe bol boo bot box btb btd bte btl bto btt btx bxb bxd bxl bxo bxx dbb dbd dbe dbl dbo dbt dbx ddb ddd dde ddl ddo ddt ddx de- deb ded dee del deo det dex dl- dlb dld dle dll dlo dlt dlx dob dod doe dol doo dot dox dtb dtd dte dtl dto dtt dtx dxd dxl dxo dxt dxx ebb ebd ebe ebl ebo ebt ebx ed- edb edd ede edl edo edt edx eeb eed eee eel eeo eet eex elb eld ele ell elo elt elx eo- eob eod eoe eol eoo eot etb etd ete etl eto ett etx ex- exd exe exl exo ext exx lbb lbd lbe lbl lbo lbt lbx ldb ldd lde ldl ldo ldt leb led lee lel leo let lex llb lld lle lll llo llt lob lod loe lol loo lot lox ltb ltd lte ltl lto ltt ltx lxd lxo lxx ob- obb obd obe obl obo obt obx odb odd ode odl odo odt oeb oed oee oel oeo oet oex olb old ole oll olo olt oo- oob ood ool ooo oot oox ot- otb otd ote otl oto ott ox- oxb oxo oxt oxx t-x tbb tbd tbe tbl tbo tbt tdb tdd tde tdl tdo tdt tdx te- teb ted tee tel teo tet tex tld tle tll tlo tlt tlx to- tob tod toe tol too tot tox ttb ttd tte ttl tto ttt ttx txe txl txt xbe xbl xbx xdb xde xdt xed xee xel xet xex xlb xld xlt xod xoo xot xox xtx xxl xxo xxx