-er b-u bbb bbd bbe bbi bbr bbt bbu bbx bdb bdd bde bdi bdr bdt bdu bdx be- beb bed bee bei ber bet beu bex bi- bib bid bie bii bir bit biu bix brb brd bre bri brr brt bru brx btb btd bte bti btr btt btu btx bub bud bue bui bur but buu bux bxb bxd bxi bxx dbb dbd dbe dbi dbr dbt dbu dbx ddb ddd dde ddi ddr ddt ddu ddx de- deb ded dee dei der det deu dex di- dib did die dii dir dit diu dix drb drd dre dri drr drt dru drx dtb dtd dte dti dtr dtt dtu dtx dub dud due dui dur dut dux dxd dxi dxr dxt dxx ebb ebd ebe ebi ebr ebt ebu ebx ed- edb edd ede edi edr edt edu edx eeb eed eee eer eet eex eib eid eie eii eir eit eiu eix erb erd ere eri err ert eru etb etd ete eti etr ett etu etx eu- eub eud eue eui eur eut eux ex- exd exe exi exr ext exu exx i-d ibb ibd ibe ibi ibr ibt ibu ibx idb idd ide idi idr idt idu idx ie- ied iee iei ier iet iex iib iid iie iii iir iit iiu iix ir- irb ird ire iri irr irt iru irx itb itd ite iti itt itu itx iu- iub iud iue iui iur iut ixe ixi rbb rbd rbe rbi rbr rbt rbu rbx rdb rdd rde rdi rdr rdt rdu rdx re- reb red ree rei rer ret reu rex rib rid rie rii rir rit rix rrb rrd rri rrr rrt rru rtb rtd rte rti rtr rtt rtu rtx rub rud rue rui rur rut ruu rux rxr t-x tbb tbd tbe tbi tbr tbt tbu tdb tdd tde tdi tdr tdt tdu tdx te- teb ted tee tei ter tet teu tex tib tid tie tii tir tit tiu tix trb trd tre tri trr trt tru trx ttb ttd tte tti ttr ttt ttu ttx tub tud tue tui tur tut tuu tux txe txi txt txu ubb ube ubi ubr ubt ubu ubx udb udd ude udi udr udt udu udx ueb ued uee uei uer uet uib uid uie uii uir uit uiu ur- urb urd ure uri urr urt uru urx utb utd ute uti utr utt utu utx uue uur uut uuu uxb uxr uxt uxu xbe xbr xbx xdb xde xdi xdr xdt xed xee xer xet xeu xex xie xii xit xiu xix xrd xrt xrx xti xtr xtx xue xui xxi xxx