-er -ol bbb bbd bbe bbf bbl bbo bbr bbs bdb bdd bde bdf bdl bdo bdr bds be- beb bed bee bef bel beo ber bes bfb bfd bfe bff bfl bfo bfr bfs blb bld ble blf bll blo blr bls bob bod boe bof bol boo bor bos brb brd bre brf brl bro brr brs bsb bsd bse bsf bsl bso bsr bss dbb dbd dbe dbf dbl dbo dbr dbs ddb ddd dde ddf ddl ddo ddr dds de- deb ded dee def del deo der des dfb dfd dfe dff dfl dfo dfr dfs dl- dlb dld dle dlf dll dlo dlr dls dob dod doe dof dol doo dor dos drb drd dre drl dro drr drs dsb dsd dse dsf dsl dso dsr dss ebb ebd ebe ebf ebl ebo ebr ebs ed- edb edd ede edf edl edo edr eds eeb eed eee eef eel eeo eer ees ef- efb efd efe eff efl efo efr efs elb eld ele elf ell elo elr els eo- eob eod eoe eof eol eoo eor eos erb erd ere erf erl ero err ers es- esb esd ese esf esl eso esr ess fbb fbd fbe fbf fbl fbo fbr fbs fdb fdd fde fdf fdl fdo fdr fds feb fed fee fef fel feo fer fes ffd ffe fff ffl ffo ffr ffs flb fld fle flf fll flo flr fls fob foe fof fol foo for fos frb frd fre frf frl fro frr frs fsb fsd fse fsf fsl fso fsr fss lbb lbd lbe lbf lbl lbo lbr lbs ldb ldd lde ldf ldl ldo ldr lds leb led lee lef lel leo ler les lfb lfd lfe lff lfl lfo lfr lfs llb lld lle llf lll llo llr lls lob lod loe lof lol loo lor los lrb lrd lrf lro lrr lrs lsb lsd lse lsf lsl lso lsr lss ob- obb obd obe obf obl obo obr obs odb odd ode odf odl odo odr ods oeb oed oee oef oel oeo oer oes of- ofb ofd ofe off ofl ofo ofr ofs olb old ole olf oll olo ols oo- oob ood oof ool ooo oor oos or- orb ord ore orf orl oro orr ors os- osb osd ose osf osl oso osr oss rbb rbd rbe rbf rbl rbo rbr rbs rdb rdd rde rdf rdl rdo rdr rds re- reb red ree ref rel reo rer res rfb rfd rfe rff rfl rfo rfr rfs rld rle rlf rll rlo rlr rls rob rod roe rof rol roo ror ros rrb rrd rrf rrl rrr rrs rsb rsd rse rsf rsl rso rsr rss sbb sbd sbe sbf sbl sbo sbr sbs sdb sdd sde sdf sdl sdo sdr sds se- seb sed see sef sel seo ser ses sfb sfd sfe sff sfl sfo sfr sfs slb sld sle slf sll slo slr sls sob sod soe sof sol soo sor sos sr- srb srd sre srf srl sro srr srs ss- ssb ssd sse ssf ssl sso ssr sss