a-ak aaaa aaab aaac aaad aaal aaba aabb aabc aabd aabl aaca aacb aacc aacd aack aacl aacu aada aadc aadu aaka aaku aala aalc aald aall aalu abaa abab abac abad abak abal abau abb- abba abbb abca abcb abcc abcd abcl abda abdu abla abua abud abuk abul acaa acab acac acad acba acbl acca accc accd accu acda acdb acdc ackd acla aclc aclu acu- acul adaa adab adac adad adak adal adba adbc adcc adda addc addd addl addu adua adub aduk akaa akal akca akka akku akua alaa alac alad alak alal alau alb- alba albc albu alca alcc ald- alda aldl alk- alka alkb alkd alku all- alla alll allu alua aluk auaa auca audc aul- aula auld aull aulu baaa baad baak baal baba babb babu bac- baca bacc back bada badb badd badu bak- baka bakl baku bala balc bald balk ball balu bau- baud bauk baul bbad bbau bbbb bbdd bblb bcaa bcbc bcca bccc bccl bcda bcuc bdbc bddc blaa blab blac blad blak blau blcu bldc blkb blkd blub blud buad bual buba bubb bubu buca bucc buck bucu buda budb budd budl budu buka bukk buku bula bulb buld bulk bull bulu c-cd caaa caab caac caal caba cabu cac- caca cacc cack cada cadc cadd cadu caka cala calc cald calk call calu cauc cauk caul cbac cbal cbbc cbca cbcc cbcl cbcu cbdb cbdc cbka cbkl cblb cblc ccaa ccab ccac ccad ccba ccbc ccca cccb cccc cccl cccu ccdc ccla cclc ccuc cdaa cdac cdad cdba cdda cddb cddl ckac ckbc ckck ckcl ckdu clab clad clau clcd cldc club clud cuau cub- cuba cubb cuca cucc cuck cuda cuk- cuka cula culb culc culd culk cull daab daad daal daau daba dabb dabu daca dada dadu daka daku dala dalk dall dalu daub daud dauk dbcc dcbc dcca dccb dccc dccl dccu dcdb dddd ddlc ddub dkba dkdc dlab dlbd duaa duab duad dual dub- duba dubb dubc dubu duca duck duda dudd dudu duka duku dula dulc dull dulu duul kaaa kaab kaak kaal kaba kabb kabc kabd kabu kacb kacc kacd kacl kacu kad- kada kadd kadl kadu kaka kakc kakk kaku kala kalb kalc kald kalk kall kalu kau- kaub kauc kaud kauk kaul kbaa kbab kbac kbad kbak kbal kbba kbbb kbbc kbbd kbbk kbbl kbbu kbca kbcb kbck kbcl kbcu kbdb kbdl kbkb kbkk kbkl kbla kblb kbld kbll kblu kbua kbub kbuc kbud kbuk kbul kbuu kcaa kcab kcac kcad kcal kcau kcba kcbc kcbd kcbk kcbl kcbu kcca kccb kccc kccd kcck kccl kccu kcda kcdc kcdd kcdu kckc kckk kckl kcla kclc kclk kcll kclu kcua kcub kcuk kcul kdaa kdab kdac kdad kdak kdal kdbb kdbl kdca kdcc kdcd kddb kddc kddd kddk kddl kdka kdkb kdkd kdkk kdla kdlb kdlc kdld kdll kdub kduc kkaa kkac kkal kkba kkbb kkbd kkbl kkcb kkcd kkck kkcl kkda kkdc kkdd kkdl kkkk kklb kklc kkld kkll kkua kkuu klaa klab klac klad klak klal klbb klbc klbd klbl klbu klca klcb klcc klcd klck klcl kldc kldd klka klkc klkk klkl klla kllb kllc kllk klub kluk kluu kuac kuau kuba kubb kubc kubd kubu kuca kucb kucc kucd kuda kudd kudl kudu kuka kukk kukl kuku kula kulb kuld kull kulu kuub kuuk kuul kuuu laaa laac laad laak laal laba labu laca lacc lack lacl lacu lada ladd ladu laka lala lald lall lalu laub laud lauk laul lbcc lcac lcad lcbc lcca lccc lcdd lkab lkal llcc lldb lldc lllc llll llud luau luba luca luck luda ludd luka lula lull lulu luua luuk uabc uaca uald uaua ubac ubal ubba ubla ubud ucad ucak ucal ucbc ucca ucdc ucdd ucka ucla ucua udaa udad udal udau udbc udca uduk ukba ukcc ukla ulaa ulad ulbc ulcc ulla ulua uluk ulul uulu uuuu