dddd ddre dedd dede dedo dedu deed deer deor der- dere dero derr deue deur dod- dodd dode dodo doer dood door dord dore doro dorr doru doud doue dour dred dree drod drou drue druu dudd dude dudo dudu duer duo- dure duro duru duur edde eddo ede- eder edod edou edru edur eede eedu eeee eero eode eore erde ered erer erod eroe eroo erre erro erur eude euer eur- eure euro o-eo oddd oded odeo oder odoo odor odou odur oedo oere ooer oooo oord oore orde ordo ordu ore- ored oreo orer oro- oroe oror orro oude oued ouer our- oure ouro ouu- rder redd rede redo redr redu reed reod reou rerd rere rero reru reue reuu rodd rode rodo roed roer rood roor rore roro roru roud roue rred rrrr rudd rude rudo rued ruer rurd rure ruro ruru ruud uder udoo uor- uore urde urdu ure- ured uro- uroo urre urur uuuu