a-do aaaa aaab aaac aaad aaap aaar aaba aabb aabc aabd aabp aaca aacb aacc aacd aaco aacp aacr aacu aada aadc aadu aaoo aapa aapc aapo aara aarc aard aaro aarp aaru aaup abaa abab abac abad abap abar abau abb- abba abbb abbo abbr abca abcb abcc abcd abcp abcr abda abdo abdu aboa abob abod aboo abor abou abpa abpc abpd abpp abpr abra abrc abro abua abud acaa acab acac acad acap acar acba acca accc accd acco accp accu acda acdb acdc acdp acoa acod acop acor acou acpa acpd acpr acpu acr- acra acrc acro acrr acu- acuo acup acur adaa adab adac adad adao adap adar adba adbc adcc adda addc addd addo addr addu adob adoc adod adoo ador adp- adra adro adua adub adur aoba aoca aopo aora aorb apac apao apap apar apba apbr apca apcb apcc apcd apco apcr apda apdd apdu apo- apoc apod apoo apop apor apou appa appc appd appr appu apra aprc apro apua apuc apud apup arab arac arad arap arar arau arba arc- arca arco arda ardc ardo ardu aroa arob arod aroo aror arpa arpu arr- arra arrc arro arrr arru arua arub arud arup auaa auca aucp audc audo aupc aur- aura aurd auro baaa baad baar baba babb babo babr babu bac- baca bacc baco bada badb badd bado badr badu bapa bapc bapp bapu bar- bara barb barc bard baro barr baru bau- baud baur bbad bbau bbbb bbdd bbdo bbpr bbrc bcaa bcap bcar bcbc bcbp bcca bccc bcda bcor bcpp bcra bcru bcuc bcup bd-r bdbc bddc bdpc boab boac boad boar boba bobb bobo bobu boca boco bocu boda bodb bodo bodu boob booc bood boop boor bopa bopp bor- bora bord boro borr boru boua boud boup bour bpcp bpda bprc bprd brab brac brad brao brau brca brcb brda brdo broa brob broc brod broo bror brou brrr bruc brud brup buad buar buba bubb bubo bubu buca bucc buco bucu buda budb budd budo budu bupa bupc bur- bura burb burd buro burp burr buru c-bo c-cd caaa caab caac caap caba cabo cabu cac- caca cacc caco cacr cada cadc cadd cado cadr cadu caod caor capa capb capc capd capo capp capu cara carb carc card caro carp carr cauc cauo caup cbac cbar cbbc cbca cbcc cbcp cbcr cbcu cbdb cbdc cbdo cbpc cbpp cbrd ccaa ccab ccac ccad ccap ccar ccba ccbc ccca cccb cccc cccp cccu ccdc ccdp ccdr ccob ccoc ccod ccpa ccpp ccpr ccra ccrc ccrp ccuc ccup cd-r cdaa cdac cdad cdba cdda cddb cddr coad coba cobb cobo cobu coca coco cocp cocu coda codd coob cood coop copa copd copo copp copr cor- cora corb corc cord coro corp corr coua coub coud coup cour cpaa cpac cpad cpap cpbc cpca cpcu cppa cppd crab crac crap crar crau crbc crbu crca crcc crcr crda crdc crob croc crod croo crop cror crpc crub crud crup cuau cub- cuba cubb cuca cucc cuda cupo cupp cupr cura curb curd curo curr d-bo daab daad daap daar daau daba dabb dabo dabp dabu daca dada dado dadu daou dapa dapp dapu dara darb darc dard daro darp darr daru daub daud daur dbar dbcc dbcp dbpc dbpd dcbc dcca dccb dccc dccp dccu dcdb dcop dcpo dcra dcup dddd ddoc ddpo ddrc ddub doab doap doar doba dobb dobu doca doco docu dod- doda dodd dodo doob dood doop door dopa dopo dopp dopr dora dorc dord doro dorp dorr doru doub douc doud doup dour dpaa dpac dpbc dpcp dppa dppc draa drab drac drad drap drar drau drba drbc drca drda drob drod drop drou drra drua drub drup druu duaa duab duad duar dub- duba dubb dubc dubu duca duco duda dudd dudo dudu duo- dupa dupo dura duro duru duur oaau oara obad obba obbo obor obra obro ocab ocac ocad ocap ocbc occa occc ocpa ocpd ocpp ocra ocro ocrr ocur odac odbo odda oddd odoo odop odor odou odra odrp odur ooaa ooba oocr ooda oooo oora oord opap opar opca opo- opor oppa oppo opra opua orab orac orad orao orar orba orbb orbo orbu orca orco orda ordo ordu oro- oror orpc orra orro orub orup ouac ouad oucc oudc oupa our- oura ouro ouu- paap paar paba pabu paca pacd paco pacu pada padd pado padu paoc papa papb papp papr par- para parc pard paro parp parr paru paua paud paup paur pbac pbar pbcc pboc pbpa pcaa pcad pcap pcba pcbc pcca pccc pcoa pcod pcpb pcpp pcra pcrc pcrd pdac pdca pdcp pdoc pdpa pdpr pdrc poad poar poba pobo poca pocd poco pod- poda podd podo podu pood poop poor pop- popa popc popo popp pora porb porc poro porr poud poup pour ppac ppad ppap ppar ppcc ppcd ppoa ppod pppa pppd pppo pppp pprc ppru ppur prad prao prar prau prbc prca prcc prcd prcp pro- proa prob proc prod proo prop prou prpd prrd prud pruu puao puar pubu puca pudo pudu pupa pupu pur- pura purb puro purp purr puru puuc raab raad raba rabb rabo rabu rac- raca racc raco racu rada radc radd rado radr radu raob raoc raop rapa rapc rapd rapp rara rarb raro raua raub rauc raud raup rbbb rbbr rcac rcbc rcbo rccb rccc rcdc rcpd rcpo rcrd rdac rdap rdbp rdoc rdpc roab road roap roar rob- roba robb robo robu roca rocc roco roda rodd rodo roob rood roop roor ropa ropo rora rorc roro roru roua roub roud roup rpca rpdp rpob rrad rrrr ruad ruba rubb rubp rubu ruca ruda rudd rudo rudp rupa rupp rura rurc rurd ruro rurp ruru ruud u-rp uabc uaca uaoc uarc uaru uaua ubac ubar ubba ubbo uboc ubod ubpc ubra ubud ucad ucar ucbc ucca uccp ucdc ucdd ucpa ucpb ucrc ucua udaa udad udar udau udbc udca udoo udop