a-ak a-do a-ok aaaa aaab aaac aaad aaal aaba aabb aabc aabd aabl aaca aacb aacc aacd aack aacl aaco aada aadc aaka aala aalc aald aall aalo aaoo abaa abab abac abad abak abal abb- abba abbb abbo abca abcb abcc abcd abcl abda abdo abla ablo aboa abob abod abok abol aboo acaa acab acac acad acba acbl acca accc accd acco acda acdb acdc ackd acla aclc acoa acod acol adaa adab adac adad adak adal adao adba adbc adcc adda addc addd addl addo adob adoc adod adok adoo akaa akal akao akca akka akko aklo akok alaa alac alad alak alal alao alb- alba albc albo alca alcc alco ald- alda aldl aldo alk- alka alkb alkd alko all- alla alll allo aloa aloc alod alok alol aloo aoba aoca aola baaa baad baak baal baba babb babo bac- baca bacc back baco bada badb badd bado bak- baka bakl bako bala balc bald balk ball balo baol bbad bbbb bbdd bbdo bblb bcaa bcbc bcca bccc bccl bcda bdbc bddc blaa blab blac blad blak bldc blkb blkd blob bloc blod blok bloo boab boac boad boak boal boba bobb bobo boca bock boco boda bodb bodo boka boko bola bold bolk boll bolo boob booc bood book bool c-bo c-cd caaa caab caac caal caba cabo cac- caca cacc cack caco cada cadc cadd cado caka cala calc cald calk call calo caod caol cbac cbal cbbc cbca cbcc cbcl cbdb cbdc cbdo cbka cbkl cbko cblb cblc cbol ccaa ccab ccac ccad ccba ccbc ccca cccb cccc cccl ccdc ccla cclc ccob ccoc ccod cdaa cdac cdad cdba cdda cddb cddl ckac ckbc ckck ckcl ckco ckdo ckoa ckob ckoc ckoo clab clad clcd cldc clob clod clok cloo coad coak coal coba cobb cobo coca cock coco coda codd codl cok- coka coko col- cola colb cold colk coll colo coob cood cook cool d-bo daab daad daal daba dabb dabo daca dada dado daka dako dala dalk dall dalo dbcc dcbc dcca dccb dccc dccl dcdb dddd ddlc ddoc dkba dkdc dlab dlbd dlco doab doak doal doba dobb dobl doca dock doco dod- doda dodd dodo doka doko dola dold dolk doll dolo doob dood dook dool k-lo kaaa kaab kaak kaal kaba kabb kabc kabd kabo kacb kacc kacd kacl kaco kad- kada kadd kadl kado kaka kakc kakk kako kala kalb kalc kald kalk kall kalo kaoa kaoc kaok kaol kbaa kbab kbac kbad kbak kbal kbba kbbb kbbc kbbd kbbk kbbl kbbo kbca kbcb kbck kbcl kbco kbdb kbdl kbdo kbkb kbkk kbkl kbko kbla kblb kbld kbll kblo kboa kbob kboc kbod kbok kboo kcaa kcab kcac kcad kcal kcba kcbc kcbd kcbk kcbl kcca kccb kccc kccd kcck kccl kcda kcdc kcdd kckc kckk kckl kcko kcla kclc kclk kcll kcob kcol kdaa kdab kdac kdad kdak kdal kdao kdbb kdbl kdca kdcc kdcd kdco kddb kddc kddd kddk kddl kdka kdkb kdkd kdkk kdko kdla kdlb kdlc kdld kdll kdlo kdoc kdok kkaa kkac kkal kkba kkbb kkbd kkbl kkbo kkcb kkcd kkck kkcl kkco kkda kkdc kkdd kkdl kkdo kkkk kklb kklc kkld kkll kklo kkoa kkob kkol kkoo klaa klab klac klad klak klal klbb klbc klbd klbl klca klcb klcc klcd klck klcl kldc kldd 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 kocd kock koda kodk kodl kodo koka kokb kokc kokk koko kola kolb kolc kold kolk koll kolo koob kooc kook kool kooo laaa laac laad laak laal laba labo laca lacc lack lacl laco lada ladd lado laka lala lald lall lalo lbcc lcac lcad lcbc lcca lccc lcdd lkab lkal llao llcc lldb lldc lllc llll lloa lloc llod lloo loac load lob- loba lobb lobo loca locc lock loco loda loka lokk loko lola lold loll lolo loob looc lood look lool oall obad obak obal obba obbo obkb obla obok obol ocab ocac ocad ocak ocal ocbc occa occc oclc odac odal odbo odda oddd odla odoo okak okka okko okla oklo okok okol olac olba olbo olca olcc oldb olka olla ollo ooaa ooak ooba ooda oola oold oolo oooo