-vac a-do aaaa aaab aaac aaad aaar aaav aaba aabb aabc aabd aaca aacb aacc aacd aaco aacr aacv aada aadc aaoo aara aarc aard aaro aava abaa abab abac abad abar abb- abba abbb abbo abbr abca abcb abcc abcd abcr abda abdo aboa abob abod aboo abor abov abra abrc abro abva abvd acaa acab acac acad acar acba acca accc accd acco acda acdb acdc acoa acod acor acr- acra acrc acro acrr acrv acvv adaa adab adac adad adao adar adba adbc adcc adda addc addd addo addr adob adoc adod adoo ador adra adro advb aoba aoca aora aorb arab arac arad arar arba arc- arca arco arda ardc ardo aroa arob arod aroo aror arr- arra arrc arro arrr arva arvo avab avao avar avcc avco avda avor avra avro avva avvo baaa baad baar baba babb babo babr bac- baca bacc baco bada badb badd bado badr bar- bara barb barc bard baro barr bava bbad bbbb bbdd bbdo bbrc bcaa bcar bcbc bcca bccc bcda bcor bcra bcvo bd-r bdav bdbc bddc boab boac boad boar boba bobb bobo boca boco boda bodb bodo boob booc bood boor bor- bora bord boro borr bova bovo brab brac brad brao brav brca brcb brda brdo broa brob broc brod broo bror brrr c-bo c-cd caaa caab caac caba cabo cac- caca cacc caco cacr cada cadc cadd cado cadr caod caor cara carb carc card caro carr cava cavo cbac cbar cbbc cbca cbcc cbcr cbdb cbdc cbdo cbrd cbva cbvb cbvr ccaa ccab ccac ccad ccar ccba ccbc ccca cccb cccc cccv ccdc ccdr ccob ccoc ccod ccra ccrc ccvo cd-r cdaa cdac cdad cdba cdda cddb cddr cdvd coad coba cobb cobo coca coco coda codd coob cood cor- cora corb corc cord coro corr cova covo crab crac crar crbc crca crcc crcr crda crdc crob croc crod croo cror cvac cvar cvca cvcc cvra cvrd cvrr d-bo daab daad daar daba dabb dabo daca dada dado dara darb darc dard daro darr dava dbar dbcc dcbc dcca dccb dccc dccv dcdb dcra dcvd dddd ddoc ddrc doab doar doba dobb doca doco dod- doda dodd dodo doob dood door dora dorc dord doro dorr draa drab drac drad drar drba drbc drca drda drob drod drra dvar dvda dvdr dvoa dvor dvra oara obad obba obbo obor obra obro ocab ocac ocad ocbc occa occc ocra ocro ocrr odac odbo odda oddd odoo odor odra odva ooaa ooba oocr ooda oooo oora oord orab orac orad orao orar orav orba orbb orbo orca orco orda ordo oro- oror orra orro orvr ovar ovda ovo- ovod ovoo ovra raab raad raba rabb rabo rac- raca racc raco racv rada radc radd rado radr raob raoc rara rarb raro rava rbbb rbbr rcac rcbc rcbo rccb rccc rcdc rcrd rcvr rdac rdoc roab road roar rob- roba robb robo roca rocc roco roda rodd rodo roob rood roor rora rorc roro rova rovo rrad rrrr rv-c rvca vaad vaar vaca vaco vada vado vara vard varr vava vbcc vdcc voad voar voca voda vodo vooc voor vor- vora vord voro vrac vrav vrba vroc vvob vvvv