-er -ol bbb bbd bbe bbl bbo bbr bbt bdb bdd bde bdl bdo bdr bdt be- beb bed bee bel beo ber bet blb bld ble bll blo blr blt bob bod boe bol boo bor bot brb brd bre brl bro brr brt btb btd bte btl bto btr btt dbb dbd dbe dbl dbo dbr dbt ddb ddd dde ddl ddo ddr ddt de- deb ded dee del deo der det dl- dlb dld dle dll dlo dlr dlt dob dod doe dol doo dor dot drb drd dre drl dro drr drt dtb dtd dte dtl dto dtr dtt ebb ebd ebe ebl ebo ebr ebt ed- edb edd ede edl edo edr edt eeb eed eee eel eeo eer eet elb eld ele ell elo elr elt eo- eob eod eoe eol eoo eor eot erb erd ere erl ero err ert etb etd ete etl eto etr ett lbb lbd lbe lbl lbo lbr lbt ldb ldd lde ldl ldo ldr ldt leb led lee lel leo ler let llb lld lle lll llo llr llt lob lod loe lol loo lor lot lrb lrd lro lrr lrt ltb ltd lte ltl lto ltr ltt ob- obb obd obe obl obo obr obt odb odd ode odl odo odr odt oeb oed oee oel oeo oer oet olb old ole oll olo olt oo- oob ood ool ooo oor oot or- orb ord ore orl oro orr ort ot- otb otd ote otl oto otr ott rbb rbd rbe rbl rbo rbr rbt rdb rdd rde rdl rdo rdr rdt re- reb red ree rel reo rer ret rld rle rll rlo rlr rlt rob rod roe rol roo ror rot rrb rrd rrl rrr rrt rtb rtd rte rtl rto rtr rtt tbb tbd tbe tbl tbo tbr tbt tdb tdd tde tdl tdo tdr tdt te- teb ted tee tel teo ter tet tld tle tll tlo tlr tlt to- tob tod toe tol too tor tot trb trd tre trl tro trr trt ttb ttd tte ttl tto ttr ttt