-ol bbb bbd bbe bbl bbo bdb bdd bde bdl bdo be- beb bed bee bel beo blb bld ble bll blo bob bod boe bol boo dbb dbd dbe dbl dbo ddb ddd dde ddl ddo de- deb ded dee del deo dl- dlb dld dle dll dlo dob dod doe dol doo ebb ebd ebe ebl ebo ed- edb edd ede edl edo eeb eed eee eel eeo elb eld ele ell elo eo- eob eod eoe eol eoo lbb lbd lbe lbl lbo ldb ldd lde ldl ldo leb led lee lel leo llb lld lle lll llo lob lod loe lol loo ob- obb obd obe obl obo odb odd ode odl odo oeb oed oee oel oeo olb old ole oll olo oo- oob ood ool ooo