-er ddd dde ddi ddo ddr ddu ddx de- ded dee dei deo der deu dex di- did die dii dio dir diu dix dod doe doi doo dor dou dox drd dre dri dro drr dru drx dud due dui duo dur dux dxd dxi dxo dxr dxx ed- edd ede edi edo edr edu edx eed eee eeo eer eex eid eie eii eio eir eiu eix eo- eod eoe eoi eoo eor eou erd ere eri ero err eru eu- eud eue eui eur eux ex- exd exe exi exo exr exu exx i-d idd ide idi ido idr idu idx ie- ied iee iei ier iex iid iie iii iio iir iiu iix io- iod ioe ioi ioo ior iou ir- ird ire iri iro irr iru irx iu- iud iue iui iur ixe ixi o-i odd ode odi odo odr odu oed oee oei oeo oer oex oid oie oii oio oir oiu oo- ood ooi ooo oor oox or- ord ore ori oro orr oru orx ou- oud oue oui ouo our ox- oxi oxo oxx rdd rde rdi rdo rdr rdu rdx re- red ree rei reo rer reu rex rid rie rii rio rir rix rod roe roi roo ror rou rox rrd rri rrr rru rud rue rui ruo rur ruu rux rxr udd ude udi udo udr udu udx ued uee uei uer uid uie uii uio uir uiu uod uoe uoo uor uox ur- urd ure uri uro urr uru urx uue uur uuu uxo uxr uxu xde xdi xdr xed xee xer xeu xex xie xii xio xiu xix xod xoi xoo xor xox xrd xrx xue xui xxi xxo xxx