a-ak a-ok aaaa aaab aaac aaba aabb aabc aaca aacb aacc aack aaco aaka aaoo abaa abab abac abaj abak abb- abba abbb abbo abca abcb abcc aboa abob abok aboo acaa acab acac acba acca accc acco acoa ajab ajac ajak ajao ajba ajka ajob ajoo akaa akao akca akka akko akok aoba aoca baaa baak baba babb babo bac- baca bacc back baco baja bak- baka bako bbbb bcaa bcbc bcca bccc bjcc bjoa boab boac boak boba bobb bobo boca bock boco bojo boka boko boob booc book c-bo caaa caab caac caba cabo cac- caca cacc cack caco caja caka cbac cbbc cbca cbcc cbka cbkj cbko ccaa ccab ccac ccba ccbc ccca cccb cccc ccjo ccob ccoc cjbc cjbk cjca cjcb cjcj cjob ckac ckbc ckck ckco ckoa ckob ckoc ckoo coak coba cobb cobo coca cock coco cojo cok- coka coko coob cook jaak jaba jabo jaca jacc jack jaco jaja jaka jako jbaa jbob jcbc jccc jjcc joab joao joba jobo joca jock joco jojo joka jokb jook kaaa kaab kaak kaba kabb kabc kabo kacb kacc kaco kaja kajb kajc kajk kajo kaka kakc kakj kakk kako kaoa kaoc kaok kbaa kbab kbac kbak kbba kbbb kbbc kbbk kbbo kbca kbcb kbck kbco kbja kbjc kbjk kbkb kbkk kbko kboa kbob kboc kbok kboo kcaa kcab kcac kcba kcbc kcbk kcca kccb kccc kcck kcjb kcjc kcjj kcjk kckc kckj kckk kcko kcob kjaa kjac kjak kjbb kjcb kjcc kjck kjjj kjjk kjjo kjkj kjkk kjoc kjoj kjok kkaa kkac kkba kkbb kkbj kkbo kkcb kkcj kkck kkco kkjb kkjk kkkj kkkk kkoa kkob kkoj kkoo koab koac koak koba kobb kobc kobk kobo koca kocb kock koja kojb kojo koka kokb kokc kokk koko koob kooc kook kooo obak obba obbo obja obkb obok ocab ocac ocak ocbc occa occc ojak ojok okak okja okka okko okok ooaa ooak ooba oooo