-er -ol bbb bbd bbe bbf bbl bbo bbr bbt bdb bdd bde bdf bdl bdo bdr bdt be- beb bed bee bef bel beo ber bet bfb bfd bfe bff bfl bfo bfr bft blb bld ble blf bll blo blr blt bob bod boe bof bol boo bor bot brb brd bre brf brl bro brr brt btb btd bte btf btl bto btr btt dbb dbd dbe dbf dbl dbo dbr dbt ddb ddd dde ddf ddl ddo ddr ddt de- deb ded dee def del deo der det dfb dfd dfe dff dfl dfo dfr dft dl- dlb dld dle dlf dll dlo dlr dlt dob dod doe dof dol doo dor dot drb drd dre drl dro drr drt dtb dtd dte dtf dtl dto dtr dtt ebb ebd ebe ebf ebl ebo ebr ebt ed- edb edd ede edf edl edo edr edt eeb eed eee eef eel eeo eer eet ef- efb efd efe eff efl efo efr eft elb eld ele elf ell elo elr elt eo- eob eod eoe eof eol eoo eor eot erb erd ere erf erl ero err ert etb etd ete etf etl eto etr ett fbb fbd fbe fbf fbl fbo fbr fbt fdb fdd fde fdf fdl fdo fdr fdt feb fed fee fef fel feo fer fet ffd ffe fff ffl ffo ffr fft flb fld fle flf fll flo flr flt fob foe fof fol foo for fot frb frd fre frf frl fro frr frt ftb ftd fte ftf ftl fto ftr ftt lbb lbd lbe lbf lbl lbo lbr lbt ldb ldd lde ldf ldl ldo ldr ldt leb led lee lef lel leo ler let lfb lfd lfe lff lfl lfo lfr lft llb lld lle llf lll llo llr llt lob lod loe lof lol loo lor lot lrb lrd lrf lro lrr lrt ltb ltd lte ltf ltl lto ltr ltt ob- obb obd obe obf obl obo obr obt odb odd ode odf odl odo odr odt oeb oed oee oef oel oeo oer oet of- ofb ofd ofe off ofl ofo ofr oft olb old ole olf oll olo olt oo- oob ood oof ool ooo oor oot or- orb ord ore orf orl oro orr ort ot- otb otd ote otf otl oto otr ott rbb rbd rbe rbf rbl rbo rbr rbt rdb rdd rde rdf rdl rdo rdr rdt re- reb red ree ref rel reo rer ret rfb rfd rfe rff rfl rfo rfr rft rld rle rlf rll rlo rlr rlt rob rod roe rof rol roo ror rot rrb rrd rrf rrl rrr rrt rtb rtd rte rtf rtl rto rtr rtt tbb tbd tbe tbf tbl tbo tbr tbt tdb tdd tde tdf tdl tdo tdr tdt te- teb ted tee tef tel teo ter tet tfb tfd tfe tff tfl tfo tfr tft tld tle tlf tll tlo tlr tlt to- tob tod toe tof tol too tor tot trb trd tre trf trl tro trr trt ttb ttd tte ttf ttl tto ttr ttt