-er -ol bbb bbd bbe bbl bbo bbr bbx bdb bdd bde bdl bdo bdr bdx be- beb bed bee bel beo ber bex blb bld ble bll blo blr blx bob bod boe bol boo bor box brb brd bre brl bro brr brx bxb bxd bxl bxo bxx dbb dbd dbe dbl dbo dbr dbx ddb ddd dde ddl ddo ddr ddx de- deb ded dee del deo der dex dl- dlb dld dle dll dlo dlr dlx dob dod doe dol doo dor dox drb drd dre drl dro drr drx dxd dxl dxo dxr dxx ebb ebd ebe ebl ebo ebr ebx ed- edb edd ede edl edo edr edx eeb eed eee eel eeo eer eex elb eld ele ell elo elr elx eo- eob eod eoe eol eoo eor erb erd ere erl ero err ex- exd exe exl exo exr exx lbb lbd lbe lbl lbo lbr lbx ldb ldd lde ldl ldo ldr leb led lee lel leo ler lex llb lld lle lll llo llr lob lod loe lol loo lor lox lrb lrd lro lrr lxd lxo lxr lxx ob- obb obd obe obl obo obr obx odb odd ode odl odo odr oeb oed oee oel oeo oer oex olb old ole oll olo oo- oob ood ool ooo oor oox or- orb ord ore orl oro orr orx ox- oxb oxo oxx rbb rbd rbe rbl rbo rbr rbx rdb rdd rde rdl rdo rdr rdx re- reb red ree rel reo rer rex rld rle rll rlo rlr rob rod roe rol roo ror rox rrb rrd rrl rrr rxr xbe xbl xbr xbx xdb xde xdr xed xee xel xer xex xlb xld xlr xod xoo xor xox xrd xrx xxl xxo xxx