aaaa aaab aaac aaad aaar aaba aabb aabc aabd aaca aacb aacc aacd aacr aada aadc aara aarc aard abaa abab abac abad abag abar abb- abba abbb abbr abca abcb abcc abcd abcr abda abgd abra abrc acaa acab acac acad acag acar acba acca accc accd acda acdb acdc acga acgr acr- acra acrc acrr adaa adab adac adad adag adar adba adbc adcc adda addc addd addr adra agac agad agag agar agba agca agcc agda agga agra arab arac arad arag arar arba arc- arca arda ardc arga argb arr- arra arrc arrg arrr baaa baad baar baba babb babr bac- baca bacc bada badb badd badr baga bagg bar- bara barb barc bard barg barr bbad bbbb bbdd bbga bbrc bbrg bcaa bcar bcbc bcbg bcca bccc bcda bcra bd-r bdbc bddc bgca brab brac brad brag brca brcb brda brrr c-cd caaa caab caac caba cabg cac- caca cacc cacr cada cadc cadd cadr caga cagg cagr cara carb carc card carr cbac cbar cbbc cbca cbcc cbcr cbdb cbdc cbga cbgb cbrd ccaa ccab ccac ccad ccag ccar ccba ccbc ccca cccb cccc ccdc ccdr ccga ccgc ccra ccrc ccrg cd-r cdaa cdac cdad cdba cdda cddb cddr cgac cgcc cgcg crab crac crag crar crbc crca crcc crcr crda crdc daab daad daag daar daba dabb daca dada daga dagg dagr dara darb darc dard darg darr dbag dbar dbcc dcbc dcca dccb dccc dcdb dcra dddd ddrc dgac dgca draa drab drac drad drag drar drba drbc drca drda drra gaar gaba gabb gabr gada gadd gaga gagg gara garb gard garg garr gbag gc-c gcaa gcbc gccc gcda gcrg gdca gddb gdrc gggg grab grac grad grbr grcc grdc grrr raab raad raag raba rabb rac- raca racc rada radc radd radr raga ragg rara rarb rbbb rbbr rcac rcbc rccb rccc rcdc rcga rcgc rcrd rcrg rdac rgba rrad rrrr