a-ak a-ok aaaa aaab aaac aaal aaba aabb aabc aabl aaca aacb aacc aack aacl aaco aaka aala aalc aall aalo aaoo abaa abab abac abak abal abb- abba abbb abbo abca abcb abcc abcl abla ablo aboa abob abok abol aboo acaa acab acac acba acbl acca accc acco acla aclc acoa acol akaa akal akao akca akka akko aklo akok alaa alac alak alal alao alb- alba albc albo alca alcc alco alk- alka alkb alko all- alla alll allo aloa aloc alok alol aloo aoba aoca aola baaa baak baal baba babb babo bac- baca bacc back baco bak- baka bakl bako bala balc balk ball balo baol bbbb bblb bcaa bcbc bcca bccc bccl blaa blab blac blak blkb blob bloc blok bloo boab boac boak boal boba bobb bobo boca bock boco boka boko bola bolk boll bolo boob booc book bool c-bo caaa caab caac caal caba cabo cac- caca cacc cack caco caka cala calc calk call calo caol cbac cbal cbbc cbca cbcc cbcl cbka cbkl cbko cblb cblc cbol ccaa ccab ccac ccba ccbc ccca cccb cccc cccl ccla cclc ccob ccoc ckac ckbc ckck ckcl ckco ckoa ckob ckoc ckoo clab clob clok cloo coak coal coba cobb cobo coca cock coco cok- coka coko col- cola colb colk coll colo coob cook cool k-lo kaaa kaab kaak kaal kaba kabb kabc kabo kacb kacc kacl kaco kaka kakc kakk kako kala kalb kalc kalk kall kalo kaoa kaoc kaok kaol kbaa kbab kbac kbak kbal kbba kbbb kbbc kbbk kbbl kbbo kbca kbcb kbck kbcl kbco kbkb kbkk kbkl kbko kbla kblb kbll kblo kboa kbob kboc kbok kboo kcaa kcab kcac kcal kcba kcbc kcbk kcbl kcca kccb kccc kcck kccl kckc kckk kckl kcko kcla kclc kclk kcll kcob kcol kkaa kkac kkal kkba kkbb kkbl kkbo kkcb kkck kkcl kkco kkkk kklb kklc kkll kklo kkoa kkob kkol kkoo klaa klab klac klak klal klbb klbc klbl klca klcb klcc klck klcl klka klkc klkk klkl klko klla kllb kllc kllk kloa klob kloc klok klol kloo koab koac koak koal koba kobb kobc kobk kobo koca kocb kock koka kokb kokc kokk koko kola kolb kolc kolk koll kolo koob kooc kook kool kooo laaa laac laak laal laba labo laca lacc lack lacl laco laka lala lall lalo lbcc lcac lcbc lcca lccc lkab lkal llao llcc lllc llll lloa lloc lloo loac lob- loba lobb lobo loca locc lock loco loka lokk loko lola loll lolo loob looc look lool oall obak obal obba obbo obkb obla obok obol ocab ocac ocak ocal ocbc occa occc oclc okak okka okko okla oklo okok okol olac olba olbo olca olcc olka olla ollo ooaa ooak ooba oola oolo oooo