aaaa aaab aaac aaad aaal aaar aaba aabb aabc aabd aabl aaca aacb aacc aacd aacl aacr aada aadc aala aalc aald aall aara aarc aard abaa abab abac abad abal abar abb- abba abbb abbr abca abcb abcc abcd abcl abcr abda abla abra abrc acaa acab acac acad acar acba acbl acca accc accd acda acdb acdc acla aclc aclr acr- acra acrc acrr adaa adab adac adad adal adar adba adbc adcc adda addc addd addl addr adra alaa alac alad alal alar alb- alba albc alca alcc ald- alda aldl all- alla alll allr arab arac arad aral arar arba arc- arca arda ardc ardl arla arr- arra arrc arrr baaa baad baal baar baba babb babr bac- baca bacc bada badb badd badr bala balc bald ball bar- bara barb barc bard barr bbad bbbb bbdd bblb bbrc bcaa bcar bcbc bcca bccc bccl bcda bcra bd-r bdbc bddc blaa blab blac blad bldc bldr blrc brab brac brad brca brcb brda brrr c-cd caaa caab caac caal caba cac- caca cacc cacr cada cadc cadd cadr cala calc cald call cara carb carc card carl carr cbac cbal cbar cbbc cbca cbcc cbcl cbcr cbdb cbdc cblb cblc cbrd cbrl ccaa ccab ccac ccad ccar ccba ccbc ccca cccb cccc cccl ccdc ccdr ccla cclc ccra ccrc ccrl cd-r cdaa cdac cdad cdba cdda cddb cddl cddr clab clad clar clcd cldc cldr clra clrd crab crac crar crbc crca crcc crcr crda crdc daab daad daal daar daba dabb daca dada dala dall dara darb darc dard darl darr dbar dbcc dcbc dcca dccb dccc dccl dcdb dcra dddd ddlc ddrc dlab dlbd draa drab drac drad drar drba drbc drca drda drra laaa laac laad laal laar laba labr laca lacc lacl lada ladd lala lald lall lara larb larc lard larr lbar lbcc lblr lcac lcad lcbc lcca lccc lcdd lcdr lcra lcrd lcrl llcc lldb lldc lllc llll lrac lral lrba lrdd lrrc lrrr raab raad raba rabb rabl rac- raca racc rada radc radd radl radr rala ralb rall rara rarb rbbb rbbr rbcl rcac rcbc rccb rccc rcdc rcrd rdac rlab rrad rrrr