-ol b-u bbb bbd bbe bbl bbo bbu bbx bdb bdd bde bdl bdo bdu bdx be- beb bed bee bel beo beu bex blb bld ble bll blo blu blx bob bod boe bol boo bou box bub bud bue bul buo buu bux bxb bxd bxl bxo bxx dbb dbd dbe dbl dbo dbu dbx ddb ddd dde ddl ddo ddu ddx de- deb ded dee del deo deu dex dl- dlb dld dle dll dlo dlu dlx dob dod doe dol doo dou dox dub dud due dul duo dux dxd dxl dxo dxx ebb ebd ebe ebl ebo ebu ebx ed- edb edd ede edl edo edu edx eeb eed eee eel eeo eex elb eld ele ell elo elu elx eo- eob eod eoe eol eoo eou eu- eub eud eue eul eux ex- exd exe exl exo exu exx lbb lbd lbe lbl lbo lbu lbx ldb ldd lde ldl ldo ldu leb led lee lel leo leu lex llb lld lle lll llo llu lob lod loe lol loo lou lox lub lud lue lul luo luu lux lxd lxo lxx ob- obb obd obe obl obo obu obx odb odd ode odl odo odu oeb oed oee oel oeo oex olb old ole oll olo olu oo- oob ood ool ooo oox ou- oud oue oul ouo ox- oxb oxo oxx ubb ube ubl ubo ubu ubx udb udd ude udl udo udu udx ueb ued uee uel ulb uld ule ull ulo ulu uob uod uoe uol uoo uox uue uuu uxb uxo uxu xbe xbl xbx xdb xde xed xee xel xeu xex xlb xld xod xoo xox xue xul xxl xxo xxx