-ol bbb bbd bbe bbl bbo bbt bdb bdd bde bdl bdo bdt be- beb bed bee bel beo bet blb bld ble bll blo blt bob bod boe bol boo bot btb btd bte btl bto btt dbb dbd dbe dbl dbo dbt ddb ddd dde ddl ddo ddt de- deb ded dee del deo det dl- dlb dld dle dll dlo dlt dob dod doe dol doo dot dtb dtd dte dtl dto dtt ebb ebd ebe ebl ebo ebt ed- edb edd ede edl edo edt eeb eed eee eel eeo eet elb eld ele ell elo elt eo- eob eod eoe eol eoo eot etb etd ete etl eto ett lbb lbd lbe lbl lbo lbt ldb ldd lde ldl ldo ldt leb led lee lel leo let llb lld lle lll llo llt lob lod loe lol loo lot ltb ltd lte ltl lto ltt ob- obb obd obe obl obo obt odb odd ode odl odo odt oeb oed oee oel oeo oet olb old ole oll olo olt oo- oob ood ool ooo oot ot- otb otd ote otl oto ott tbb tbd tbe tbl tbo tbt tdb tdd tde tdl tdo tdt te- teb ted tee tel teo tet tld tle tll tlo tlt to- tob tod toe tol too tot ttb ttd tte ttl tto ttt