-er b-u bbb bbd bbe bbi bbo bbr bbu bdb bdd bde bdi bdo bdr bdu be- beb bed bee bei beo ber beu bi- bib bid bie bii bio bir biu bob bod boe boi boo bor bou brb brd bre bri bro brr bru bub bud bue bui buo bur buu dbb dbd dbe dbi dbo dbr dbu ddb ddd dde ddi ddo ddr ddu de- deb ded dee dei deo der deu di- dib did die dii dio dir diu dob dod doe doi doo dor dou drb drd dre dri dro drr dru dub dud due dui duo dur ebb ebd ebe ebi ebo ebr ebu ed- edb edd ede edi edo edr edu eeb eed eee eeo eer eib eid eie eii eio eir eiu eo- eob eod eoe eoi eoo eor eou erb erd ere eri ero err eru eu- eub eud eue eui eur i-d ibb ibd ibe ibi ibo ibr ibu idb idd ide idi ido idr idu ie- ied iee iei ier iib iid iie iii iio iir iiu io- iob iod ioe ioi ioo ior iou ir- irb ird ire iri iro irr iru iu- iub iud iue iui iur o-i ob- obb obd obe obi obo obr obu odb odd ode odi odo odr odu oeb oed oee oei oeo oer oib oid oie oii oio oir oiu oo- oob ood ooi ooo oor or- orb ord ore ori oro orr oru ou- oud oue oui ouo our rbb rbd rbe rbi rbo rbr rbu rdb rdd rde rdi rdo rdr rdu re- reb red ree rei reo rer reu rib rid rie rii rio rir rob rod roe roi roo ror rou rrb rrd rri rrr rru rub rud rue rui ruo rur ruu ubb ube ubi ubo ubr ubu udb udd ude udi udo udr udu ueb ued uee uei uer uib uid uie uii uio uir uiu uob uod uoe uoo uor ur- urb urd ure uri uro urr uru uue uur uuu