-vac aaaa aaab aaac aaar aaav aaba aabb aabc aaca aacb aacc aaco aacr aacu aacv aaoo aara aarc aaro aaru aava abaa abab abac abar abau abb- abba abbb abbo abbr abca abcb abcc abcr aboa abob aboo abor abou abov abra abrc abro abua abva acaa acab acac acar acba acca accc acco accu acoa acor acou acr- acra acrc acro acrr acrv acu- acuo acur acvv aoba aoca aora aorb arab arac arar arau arba arc- arca arco aroa arob aroo aror arr- arra arrc arro arrr arru arua arub arva arvo auaa auca aur- aura auro avab avao avar avcc avco avor avou avra avro avur avva avvo baaa baar baba babb babo babr babu bac- baca bacc baco bar- bara barb barc baro barr baru bau- baur bava bavu bbau bbbb bbrc bcaa bcar bcbc bcca bccc bcor bcra bcru bcuc bcvo boab boac boar boba bobb bobo bobu boca boco bocu boob booc boor bor- bora boro borr boru boua bour bova bovo brab brac brao brau brav brca brcb broa brob broc broo bror brou brrr bruc bruv buar buba bubb bubo bubu buca bucc buco bucu bur- bura burb buro burr buru c-bo caaa caab caac caba cabo cabu cac- caca cacc caco cacr caor cara carb carc caro carr cauc cauo cava cavo cavu cbac cbar cbbc cbca cbcc cbcr cbcu cbva cbvb cbvr ccaa ccab ccac ccar ccba ccbc ccca cccb cccc cccu cccv ccob ccoc ccra ccrc ccuc ccvo coba cobb cobo cobu coca coco cocu coob cor- cora corb corc coro corr coua coub cour cova covo crab crac crar crau crbc crbu crca crcc crcr crob croc croo cror crub cuau cub- cuba cubb cuca cucc cura curb curo curr cvac cvar cvca cvcc cvra cvrr oaau oara obba obbo obor obra obro ocab ocac ocbc occa occc ocra ocro ocrr ocur ooaa ooba oocr oooo oora orab orac orao orar orav orba orbb orbo orbu orca orco oro- oror orra orro orub orvr ouac oucc our- oura ouro ouu- ovar ovo- ovoo ovra raab raba rabb rabo rabu rac- raca racc raco racu racv raob raoc rara rarb raro raua raub rauc rava rbbb rbbr rcac rcbc rcbo rccb rccc rcuv rcvr roab roar rob- roba robb robo robu roca rocc roco roob roor rora rorc roro roru roua roub rova rovo rrrr ruba rubb rubu ruca rura rurc ruro ruru ruvu rv-c rvca uabc uaca uaoc uarc uaru uaua ubac ubar ubba ubbo uboc ubra ucar ucav ucbc ucca ucrc ucua uocc uor- uovo urac urao urau urba urca uro- uroa uroo urra urur urva uuoc uuuu uv-a uv-b uv-c uvaa uvac uvvu vaar vaca vaco vara varr varu vava vbcc voar voca vooc voor vor- vora voro voru vour vrac vrav vrba vroc vuca vuco vurb vvob vvvv