aaaa aaab aaac aaal aaar aaba aabb aabc aabl aaca aacb aacc aacl aaco aacr aala aalc aall aalo aaoo aara aarc aaro abaa abab abac abal abar abb- abba abbb abbo abbr abca abcb abcc abcl abcr abla ablo aboa abob abol aboo abor abra abrc abro acaa acab acac acar acba acbl acca accc acco acla aclc aclr acoa acol acor acr- acra acrc acro acrr alaa alac alal alao alar alb- alba albc albo alca alcc alco all- alla alll allo allr aloa aloc alol aloo alor alro aoba aoca aola aora aorb arab arac aral arar arba arc- arca arco arla arlo aroa arob aroo aror arr- arra arrc arro arrr baaa baal baar baba babb babo babr bac- baca bacc baco bala balc ball balo baol bar- bara barb barc baro barr bbbb bblb bbrc bcaa bcar bcbc bcca bccc bccl bcor bcra blaa blab blac blob bloc bloo blrc boab boac boal boar boba bobb bobo boca boco bola boll bolo boob booc bool boor bor- bora boro borr brab brac brao brca brcb broa brob broc brol broo bror brrr c-bo caaa caab caac caal caba cabo cac- caca cacc caco cacr cala calc call calo caol caor cara carb carc carl caro carr cbac cbal cbar cbbc cbca cbcc cbcl cbcr cblb cblc cbol cbrl ccaa ccab ccac ccar ccba ccbc ccca cccb cccc cccl ccla cclc ccob ccoc ccra ccrc ccrl clab clar clob cloo clor clra clro coal coba cobb cobo coca coco col- cola colb coll colo coob cool cor- cora corb corc corl coro corr crab crac crar crbc crca crcc crcr crob croc crol croo cror laaa laac laal laar laba labo labr laca lacc lacl laco lala lall lalo lara larb larc larr lbar lbcc lblr lcac lcbc lcca lccc lcor lcra lcrl llao llcc lllc llll lloa lloc lloo loac loar lob- loba lobb lobo loca locc loco lola loll lolo loob looc lool loor lora loro lrac lral lrba lroc lrrc lrrr oall oara obal obba obbo obla obol obor obra obro ocab ocac ocal ocbc occa occc oclc ocra ocrl ocro ocrr olac olar olba olbo olca olcc olla ollo olor ooaa ooba oocr oola oolo oooo oora orab orac oral orao orar orba orbb orbo orca orco orla orlo oro- oror orra orro raab raba rabb rabl rabo rac- raca racc raco rala ralb rall ralo raob raoc raol rara rarb raro rbbb rbbr rbcl rcac rcbc rcbo rccb rccc rlab roab roar rob- roba robb robo roca rocc roco rola roll rolo roob rool roor rora rorc roro rrrr