a-a a-b a-c aaa aab aac aad aao aar aau ab- aba abb abc abd abo abr abu ac- aca acb acc acd aco acr acu ad- ada adb adc add ado adr adu aoa aob aoc aod aoo aor aou ar- ara arb arc ard aro arr aru au- aua aub auc aud auo aur b-u baa bab bac bad bao bar bau bba bbb bbc bbd bbo bbr bbu bca bcb bcc bcd bco bcr bcu bda bdb bdc bdd bdo bdr bdu boa bob boc bod boo bor bou bra brb brd bro brr bru bua bub buc bud buo bur buu c-- caa cab cac cad cao car cau cba cbb cbc cbd cbo cbr cbu cca ccb ccc ccd cco ccr ccu cda cdb cdc cdd cdo cdr cdu co- coa cob coc cod coo cor cou cra crb crc crd cro crr cru cua cub cuc cud cuo cur cuu daa dab dac dad dao dar dau dba dbb dbc dbd dbo dbr dbu dca dcb dcc dcd dco dcr dcu dda ddb ddc ddd ddo ddr ddu doa dob doc dod doo dor dou dra drb drc drd dro drr dru dua dub duc dud duo dur oaa oab oac oad oao oar oau ob- oba obb obc obd obo obr obu oc- oca ocb occ ocd oco ocr ocu oda odb odc odd odo odr odu oo- ooa oob ooc ood ooo oor or- ora orb orc ord oro orr oru ou- oua ouc oud ouo our ra- raa rab rac rad rao rar rau rba rbb rbc rbd rbo rbr rbu rca rcb rcc rcd rco rcr rcu rda rdb rdc rdd rdo rdr rdu roa rob roc rod roo ror rou rra rrb rrc rrd rrr rru rua rub ruc rud ruo rur ruu ua- uaa uab uac uad uao uar uau uba ubb ubc ubo ubr ubu uca ucb ucc ucd uco ucr ucu uda udb udc udd udo udr udu uoa uob uoc uod uoo uor ur- ura urb urc urd uro urr uru uua uuc uur uuu

a-do aaaa aaab aaac aaad aaar aaba aabb aabc aabd aaca aacb aacc aacd aaco aacr aacu aada aadc aadu aaoo aara aarc aard aaro aaru abaa abab abac abad abar abau abb- abba abbb abbo abbr abca abcb abcc abcd abcr abda abdo abdu aboa abob abod aboo abor abou abra abrc abro abua abud acaa acab acac acad acar acba acca accc accd acco accu acda acdb acdc acoa acod acor acou acr- acra acrc acro acrr acu- acuo acur adaa adab adac adad adao adar adba adbc adcc adda addc addd addo addr addu adob adoc adod adoo ador adra adro adua adub adur aoba aoca aora aorb arab arac arad arar arau arba arc- arca arco arda ardc ardo ardu aroa arob arod aroo aror arr- arra arrc arro arrr arru arua arub arud auaa auca audc audo aur- aura aurd auro baaa baad baar baba babb babo babr babu bac- baca bacc baco bada badb badd bado badr badu bar- bara barb barc bard baro barr baru bau- baud baur bbad bbau bbbb bbdd bbdo bbrc bcaa bcar bcbc bcca bccc bcda bcor bcra bcru bcuc bd-r bdbc bddc boab boac boad boar boba bobb bobo bobu boca boco bocu boda bodb bodo bodu boob booc bood boor bor- bora bord boro borr boru boua boud bour brab brac brad brao brau brca brcb brda brdo broa brob broc brod broo bror brou brrr bruc brud buad buar buba bubb bubo bubu buca bucc buco bucu buda budb budd budo budu bur- bura burb burd buro burr buru c-bo c-cd caaa caab caac caba cabo cabu cac- caca cacc caco cacr cada cadc cadd cado cadr cadu caod caor cara carb carc card caro carr cauc cauo cbac cbar cbbc cbca cbcc cbcr cbcu cbdb cbdc cbdo cbrd ccaa ccab ccac ccad ccar ccba ccbc ccca cccb cccc cccu ccdc ccdr ccob ccoc ccod ccra ccrc ccuc cd-r cdaa cdac cdad cdba cdda cddb cddr coad coba cobb cobo cobu coca coco cocu coda codd coob cood cor- cora corb corc cord coro corr coua coub coud cour crab crac crar crau crbc crbu crca crcc crcr crda crdc crob croc crod croo cror crub crud cuau cub- cuba cubb cuca cucc cuda cura curb curd curo curr d-bo daab daad daar daau daba dabb dabo dabu daca dada dado dadu daou dara darb darc dard daro darr daru daub daud daur dbar dbcc dcbc dcca dccb dccc dccu dcdb dcra dddd ddoc ddrc ddub doab doar doba dobb dobu doca doco docu dod- doda dodd dodo doob dood door dora dorc dord doro dorr doru doub douc doud dour draa drab drac drad drar drau drba drbc drca drda drob drod drou drra drua drub druu duaa duab duad duar dub- duba dubb dubc dubu duca duco duda dudd dudo dudu duo- dura duro duru duur oaau oara obad obba obbo obor obra obro ocab ocac ocad ocbc occa occc ocra ocro ocrr ocur odac odbo odda oddd odoo odor odou odra odur ooaa ooba oocr ooda oooo oora oord orab orac orad orao orar orba orbb orbo orbu orca orco orda ordo ordu oro- oror orra orro orub ouac ouad oucc oudc our- oura ouro ouu- raab raad raba rabb rabo rabu rac- raca racc raco racu rada radc radd rado radr radu raob raoc rara rarb raro raua raub rauc raud rbbb rbbr rcac rcbc rcbo rccb rccc rcdc rcrd rdac rdoc roab road roar rob- roba robb robo robu roca rocc roco roda rodd rodo roob rood roor rora rorc roro roru roua roub roud rrad rrrr ruad ruba rubb rubu ruca ruda rudd rudo rura rurc rurd ruro ruru ruud uabc uaca uaoc uarc uaru uaua ubac ubar ubba ubbo uboc ubod ubra ubud ucad ucar ucbc ucca ucdc ucdd ucrc ucua udaa udad udar udau udbc udca udoo udra