a-ak a-do a-ok aaaa aaab aaac aaad aaba aabb aabc aabd aaca aacb aacc aacd aack aaco aacu aada aadc aadu aaka aaku aaoo abaa abab abac abad abak abau abb- abba abbb abbo abca abcb abcc abcd abda abdo abdu aboa abob abod abok aboo abou abua abud abuk acaa acab acac acad acba acca accc accd acco accu acda acdb acdc ackd acoa acod acou acu- acuo adaa adab adac adad adak adao adba adbc adcc adda addc addd addo addu adob adoc adod adok adoo adua adub aduk akaa akao akca akka akko akku akok akua aoba aoca auaa auca audc audo baaa baad baak baba babb babo babu bac- baca bacc back baco bada badb badd bado badu bak- baka bako baku bau- baud bauk bbad bbau bbbb bbdd bbdo bcaa bcbc bcca bccc bcda bcuc bdbc bddc boab boac boad boak boba bobb bobo bobu boca bock boco bocu boda bodb bodo bodu boka boko boku boob booc bood book boua boud bouk buad buba bubb bubo bubu buca bucc buck buco bucu buda budb budd budo budu buka bukk buko buku c-bo c-cd caaa caab caac caba cabo cabu cac- caca cacc cack caco cada cadc cadd cado cadu caka caod cauc cauk cauo cbac cbbc cbca cbcc cbcu cbdb cbdc cbdo cbka cbko ccaa ccab ccac ccad ccba ccbc ccca cccb cccc cccu ccdc ccob ccoc ccod ccuc cdaa cdac cdad cdba cdda cddb ckac ckbc ckck ckco ckdo ckdu ckoa ckob ckoc ckoo coad coak coba cobb cobo cobu coca cock coco cocu coda codd cok- coka coko coob cood cook coua coub coud couk cuau cub- cuba cubb cuca cucc cuck cuda cuk- cuka d-bo daab daad daau daba dabb dabo dabu daca dada dado dadu daka dako daku daou daub daud dauk dbcc dcbc dcca dccb dccc dccu dcdb dddd ddoc ddub dkba dkdc doab doak doba dobb dobu doca dock doco docu dod- doda dodd dodo doka doko doob dood dook doub douc doud douk duaa duab duad dub- duba dubb dubc dubu duca duck duco duda dudd dudo dudu duka duku duo- kaaa kaab kaak kaba kabb kabc kabd kabo kabu kacb kacc kacd kaco kacu kad- kada kadd kado kadu kaka kakc kakk kako kaku kaoa kaoc kaok kau- kaub kauc kaud kauk kauo kbaa kbab kbac kbad kbak kbba kbbb kbbc kbbd kbbk kbbo kbbu kbca kbcb kbck kbco kbcu kbdb kbdo kbkb kbkk kbko kboa kbob kboc kbod kbok kboo kbua kbub kbuc kbud kbuk kbuu kcaa kcab kcac kcad kcau kcba kcbc kcbd kcbk kcbu kcca kccb kccc kccd kcck kccu kcda kcdc kcdd kcdu kckc kckk kcko kcob kcou kcua kcub kcuk kdaa kdab kdac kdad kdak kdao kdbb kdca kdcc kdcd kdco kddb kddc kddd kddk kdka kdkb kdkd kdkk kdko kdoc kdok kdub kduc kkaa kkac kkba kkbb kkbd kkbo kkcb kkcd kkck kkco kkda kkdc kkdd kkdo kkkk kkoa kkob kkoo kkua kkuu koab koac koak koba kobb kobc kobk kobo kobu koca kocb kocd kock koda kodk kodo kodu koka kokb kokc kokk koko koku koob kooc kook kooo koou koua koub kouu kuac kuau kuba kubb kubc kubd kubo kubu kuca kucb kucc kucd kuco kuda kudd kudo kudu kuka kukk kuku kuoa kuok kuoo kuub kuuk kuuu oaau obad obak obba obbo obkb obok ocab ocac ocad ocak ocbc occa occc odac odbo odda oddd odoo odou okak okcu okka okko okok ooaa ooak ooba ooda ooku oooo ouac ouad oucc oudc ouu- uabc uaca uaoc uaua ubac ubba ubbo uboc ubod ubud ucad ucak ucbc ucca ucdc ucdd ucka ucua udaa udad udau udbc udca udoo uduk ukba ukcc ukko ukok uocc uuoc uuuu