a-do aaaa aaac aaad aaar aaca aacc aacd aaco aacr aacu aada aadc aadu aaoo aara aarc aard aaro aaru acaa acac acad acar acca accc accd acco accu acda acdc acoa acod acor acou acr- acra acrc acro acrr acu- acuo acur adaa adac adad adao adar adcc adda addc addd addo addr addu adoc adod adoo ador adra adro adua adur aoca aora arac arad arar arau arc- arca arco arda ardc ardo ardu aroa arod aroo aror arr- arra arrc arro arrr arru arua arud auaa auca audc audo aur- aura aurd auro c-cd caaa caac cac- caca cacc caco cacr cada cadc cadd cado cadr cadu caod caor cara carc card caro carr cauc cauo ccaa ccac ccad ccar ccca cccc cccu ccdc ccdr ccoc ccod ccra ccrc ccuc cd-r cdaa cdac cdad cdda cddr coad coca coco cocu coda codd cood cor- cora corc cord coro corr coua coud cour crac crar crau crca crcc crcr crda crdc croc crod croo cror crud cuau cuca cucc cuda cura curd curo curr daad daar daau daca dada dado dadu daou dara darc dard daro darr daru daud daur dcca dccc dccu dcra dddd ddoc ddrc doar doca doco docu dod- doda dodd dodo dood door dora dorc dord doro dorr doru douc doud dour draa drac drad drar drau drca drda drod drou drra drua druu duaa duad duar duca duco duda dudd dudo dudu duo- dura duro duru duur oaau oara ocac ocad occa occc ocra ocro ocrr ocur odac odda oddd odoo odor odou odra odur ooaa oocr ooda oooo oora oord orac orad orao orar orca orco orda ordo ordu oro- oror orra orro ouac ouad oucc oudc our- oura ouro ouu- raad rac- raca racc raco racu rada radc radd rado radr radu raoc rara raro raua rauc raud rcac rccc rcdc rcrd rdac rdoc road roar roca rocc roco roda rodd rodo rood roor rora rorc roro roru roua roud rrad rrrr ruad ruca ruda rudd rudo rura rurc rurd ruro ruru ruud uaca uaoc uarc uaru uaua ucad ucar ucca ucdc ucdd ucrc ucua udaa udad udar udau udca udoo udra uocc uor- urac urad urao urau urca urda urdu uro- uroa uroo urra urur uuoc uuuu