-er bbb bbd bbe bbf bbg bbi bbo bbr bbx bdb bdd bde bdf bdg bdi bdo bdr bdx be- beb bed bee bef beg bei beo ber bex bfb bfd bfe bff bfg bfi bfo bfr bfx bgb bgd bge bgf bgg bgi bgo bgr bgx bi- bib bid bie bif big bii bio bir bix bob bod boe bof bog boi boo bor box brb brd bre brf brg bri bro brr brx bxb bxd bxi bxo bxx dbb dbd dbe dbf dbg dbi dbo dbr dbx ddb ddd dde ddf ddg ddi ddo ddr ddx de- deb ded dee def deg dei deo der dex dfb dfd dfe dff dfg dfi dfo dfr dfx dgd dge dgf dgg dgi dgr di- dib did die dif dig dii dio dir dix dob dod doe dof dog doi doo dor dox drb drd dre drg dri dro drr drx dxd dxi dxo dxr dxx ebb ebd ebe ebf ebg ebi ebo ebr ebx ed- edb edd ede edf edg edi edo edr edx eeb eed eee eef eeg eeo eer eex ef- efb efd efe eff efg efi efo efr efx egb egd ege egf egg egi ego egr egx eib eid eie eif eig eii eio eir eix eo- eob eod eoe eof eog eoi eoo eor erb erd ere erf erg eri ero err ex- exd exe exi exo exr exx fbb fbd fbe fbf fbg fbi fbo fbr fbx fdb fdd fde fdf fdg fdi fdo fdr fdx feb fed fee fef feg fei feo fer fex ffd ffe fff ffg ffi ffo ffr ffx fgb fgd fge fgf fgg fgi fgr fib fid fie fif fig fii fir fix fob foe fof fog foi foo for fox frb frd fre frf frg fri fro frr fxe fxg fxi fxr fxx g-d gbd gbe gbf gbg gbi gbo gbr gbx gdb gdd gde gdf gdi gdo gdr gdx ge- geb ged gee gef geg gei geo ger gex gfb gfd gfe gff gfi gfo gfr gfx ggb ggd ggg ggi ggo ggr gib gid gie gif gig gii gio gir gob god goe gof gog goi goo gor gox grb grd gre grf grg gri gro grr grx gxf i-d i-f ibb ibd ibe ibf ibg ibi ibo ibr ibx idb idd ide idf idg idi ido idr idx ie- ied iee ief ieg iei ier iex ifb ifd ife iff ifg ifi ifo ifr ifx igb igd ige igf igg igi igo igr iib iid iie iif iii iio iir iix io- iob iod ioe iof iog ioi ioo ior ir- irb ird ire irf irg iri iro irr irx ixe ixi o-i ob- obb obd obe obf obg obi obo obr obx odb odd ode odf odg odi odo odr oeb oed oee oef oeg oei oeo oer oex of- ofb ofd ofe off ofg ofi ofo ofr ofx ogd oge ogf ogg ogi ogo ogx oib oid oie oif oii oio oir oo- oob ood oof oog ooi ooo oor oox or- orb ord ore orf org ori oro orr orx ox- oxb oxf oxi oxo oxx rbb rbd rbe rbf rbg rbi rbo rbr rbx rdb rdd rde rdf rdg rdi rdo rdr rdx re- reb red ree ref reg rei reo rer rex rfb rfd rfe rff rfg rfi rfo rfr rgb rgd rge rgf rgg rgi rgo rgr rgx rib rid rie rif rig rii rio rir rix rob rod roe rof rog roi roo ror rox rrb rrd rrf rrg rri rrr rxr xbe xbr xbx xdb xde xdf xdi xdr xed xee xeg xer xex xfe xfx xge xgi xie xii xio xix xod xof xog xoi xoo xor xox xrd xrf xrx xxi xxo xxx