-er bbb bbd bbe bbf bbi bbk bbo bbr bdb bdd bde bdf bdi bdk bdo bdr be- beb bed bee bef bei bek beo ber bfb bfd bfe bff bfi bfo bfr bi- bib bid bie bif bii bik bio bir bkb bke bkf bkk bko bkr bob bod boe bof boi bok boo bor brb brd bre brf bri brk bro brr dbb dbd dbe dbf dbi dbk dbo dbr ddb ddd dde ddf ddi ddk ddo ddr de- deb ded dee def dei dek deo der dfb dfd dfe dff dfi dfk dfo dfr di- dib did die dif dii dik dio dir dkb dke dki dkk dko dkr dob dod doe dof doi dok doo dor drb drd dre dri drk dro drr ebb ebd ebe ebf ebi ebk ebo ebr ed- edb edd ede edf edi edk edo edr eeb eed eee eef eek eeo eer ef- efb efd efe eff efi efo efr eib eid eie eif eii eik eio eir ekb ekd eke ekf eki eko ekr eo- eob eod eoe eof eoi eok eoo eor erb erd ere erf eri erk ero err fbb fbd fbe fbf fbi fbk fbo fbr fdb fdd fde fdf fdi fdk fdo fdr feb fed fee fef fei fek feo fer ffd ffe fff ffi ffk ffo ffr fib fid fie fif fii fik fir fkb fkf fki fkk fob foe fof foi fok foo for frb frd fre frf fri frk fro frr i-d i-f ibb ibd ibe ibf ibi ibk ibo ibr idb idd ide idf idi idk ido idr ie- ied iee ief iei iek ier ifb ifd ife iff ifi ifo ifr iib iid iie iif iii iio iir ikb ike ikf iki ikk iko ikr io- iob iod ioe iof ioi ioo ior ir- irb ird ire irf iri irk iro irr kbb kbd kbe kbf kbi kbk kbo kbr kdb kde kdf kdk kdo kdr ke- keb ked kee kef kei kek keo ker kfd kff kfi kfo kib kid kie kif kii kik kio kir kkb kke kki kkk kkr kob kod koe kof koi kok koo kor krd krf kri krk kro krr o-i ob- obb obd obe obf obi obk obo obr odb odd ode odf odi odo odr oeb oed oee oef oei oeo oer of- ofb ofd ofe off ofi ofo ofr oib oid oie oif oii oik oio oir okb okd oke oki okk oko okr oo- oob ood oof ooi ook ooo oor or- orb ord ore orf ori ork oro orr rbb rbd rbe rbf rbi rbk rbo rbr rdb rdd rde rdf rdi rdo rdr re- reb red ree ref rei rek reo rer rfb rfd rfe rff rfi rfk rfo rfr rib rid rie rif rii rik rio rir rkb rke rkf rkk rko rob rod roe rof roi rok roo ror rrb rrd rrf rri rrk rrr