-er bbb bbd bbe bbi bbr bbt bdb bdd bde bdi bdr bdt bdz be- beb bed bee bei ber bet bez bi- bib bid bie bii bir bit biz brb brd bre bri brr brt brz btb btd bte bti btr btt btz bzd bze bzr bzz dbb dbd dbe dbi dbr dbt dbz ddb ddd dde ddi ddr ddt ddz de- deb ded dee dei der det dez di- dib did die dii dir dit diz drb drd dre dri drr drt drz dtb dtd dte dti dtr dtt dtz dzb dzd dze dzi dzr ebb ebd ebe ebi ebr ebt ed- edb edd ede edi edr edt eeb eed eee eer eet eib eid eie eii eir eit erb erd ere eri err ert erz etb etd ete eti etr ett etz eze ezr ezz i-d ibb ibd ibe ibi ibr ibt ibz idb idd ide idi idr idt ie- ied iee iei ier iet iib iid iie iii iir iit ir- irb ird ire iri irr irt itb itd ite iti itt itz ize izi izz rbb rbd rbe rbi rbr rbt rdb rdd rde rdi rdr rdt re- reb red ree rei rer ret rez rib rid rie rii rir rit riz rrb rrd rri rrr rrt rtb rtd rte rti rtr rtt rtz rzb rze tbb tbd tbe tbi tbr tbt tbz tdb tdd tde tdi tdr tdt te- teb ted tee tei ter tet tez tib tid tie tii tir tit tiz trb trd tre tri trr trt trz ttb ttd tte tti ttr ttt tzd tze zbb zbr zbt zdt zeb zed zee zer zet zez zib zid zie zir zit ziz zte ztr zzr zzt zzz