-vac a-ak a-ok aaaa aaab aaac aaal aaav aaba aabb aabc aabl aaca aacb aacc aack aacl aaco aacv aaka aala aalc aall aalo aaoo aava abaa abab abac abak abal abb- abba abbb abbo abca abcb abcc abcl abla ablo ablv aboa abob abok abol aboo abov abva acaa acab acac acba acbl acca accc acco acla aclc acoa acol acvv 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 alov alva alvo aoba aoca aola avab aval avao avcc avco avlb avva avvo baaa baak baal baba babb babo bac- baca bacc back baco bak- baka bakl bako bala balc balk ball balo baol bava bbbb bblb bcaa bcbc bcca bccc bccl bcvo 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 bova bovo c-bo caaa caab caac caal caba cabo cac- caca cacc cack caco caka cala calc calk call calo caol cava cavo cbac cbal cbbc cbca cbcc cbcl cbka cbkl cbko cblb cblc cbol cbva cbvb ccaa ccab ccac ccba ccbc ccca cccb cccc cccl cccv ccla cclc cclv ccob ccoc ccvo ckac ckbc ckck ckcl ckco ckcv ckoa ckob ckoc ckoo ckvl ckvo clab clav clob clok cloo coak coal coba cobb cobo coca cock coco cok- coka coko col- cola colb colk coll colo coob cook cool cova covo cvac cvca cvcc k-lo kaaa kaab kaak kaal kaba kabb kabc kabo kacb kacc kacl kaco kacv kaka kakc kakk kako kala kalb kalc kalk kall kalo kalv kaoa kaoc kaok kaol kava kavb kavl kavo kavv kbaa kbab kbac kbak kbal kbba kbbb kbbc kbbk kbbl kbbo kbca kbcb kbck kbcl kbco kbkb kbkk kbkl kbko kbkv kbla kblb kbll kblo kblv kboa kbob kboc kbok kboo kbov kbva kbvb kbvc kbvo kcaa kcab kcac kcal kcav kcba kcbc kcbk kcbl kcca kccb kccc kcck kccl kccv kckc kckk kckl kcko kckv kcla kclc kclk kcll kclv kcob kcol kcvk kcvl kcvo kcvv kkaa kkac kkal kkba kkbb kkbl kkbo kkcb kkck kkcl kkco kkkk kklb kklc kkll kklo kklv kkoa kkob kkol kkoo kkov kkvv klaa klab klac klak klal klav klbb klbc klbl klca klcb klcc klck klcl klka klkc klkk klkl klko klkv klla kllb kllc kllk kllv kloa klob kloc klok klol kloo klov klvb klvk klvl klvo klvv koab koac koak koal koba kobb kobc kobk kobo koca kocb kock koka kokb kokc kokk koko kola kolb kolc kolk koll kolo kolv koob kooc kook kool kooo koov kova kovc kovk kovo kvab kvak kval kvbc kvbl kvcb kvcc kvck kvcl kvco kvcv kvkl kvlb kvlc kvlo kvlv kvoa kvob kvoc kvok kvol kvoo kvov kvvl kvvv laaa laac laak laal laba labo laca lacc lack lacl laco laka lala lall lalo lava lavc lavo lbcc lcac lcbc lcca lccc lkab lkal llao llcc lllc llll lloa lloc lloo lo-v loac lob- loba lobb lobo loca locc lock loco loka lokk loko lola loll lolo loob looc look lool lovo lvcc lvov 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 olav olba olbo olca olcc olka olla ollo olov ooaa ooak ooba oola oolo oooo oval ovo- ovol ovoo vaal vaca vack vaco vaka vala valk vall valo vava vbcc vcal vlab vlba vlcc vloc vlok voca voka vola volc volk voll volo vooc vool vovk vvob vvvv