a-ak a-ii aaaa aaab aaac aaad aaai aaba aabb aabc aabd aabi aaca aacb aacc aacd aaci aack aada aadc aadi aaib aaic aaii aaka abaa abab abac abad abag abai abak abb- abba abbb abbi abca abcb abcc abcd abci abda abdi abgd abia abib abic abid abig acaa acab acac acad acag acai acba acca accc accd acci acda acdb acdc acdi acga acgi aci- acia acic acid ackd adaa adab adac adad adag adai adak adba adbc adbi adcc adci adda addc addd addi adia adib adic adig adik adki agac agad agag agai agba agca agcc agda agga aggi agia agib agic agid agig agii aiai aiba aica aicc aicd aida aidb aidc aidi aiga aiia aiib aiic aiid aika aiki akaa akai akca akia akid akik akka akki ba-i baaa baad baak baba babb babi bac- baca bacc baci back bada badb badd badi baga bagg bagi baia baib baic baid baig baik bak- baka baki bbad bbbb bbci bbdd bbga bcaa bcbc bcbg bcca bccc bcci bcda bcia bdbc bddc bdii bgca bgia biad biak biba bibb bibi bica bicc bicg bici bick bida bidi biga bigb bigc bigd bigg bkgd c-cd caaa caab caac caba cabg cabi cac- caca cacc caci cack cada cadc cadd cadi caga cagg cagi caia caib caic caid caik caka cbac cbbc cbca cbcc cbdb cbdc cbdi cbga cbgb cbia cbid cbka cbkg ccaa ccab ccac ccad ccag ccai ccba ccbc ccca cccb cccc ccci ccdc ccdi ccga ccgc ccic ccid ccii cdaa cdac cdad cdai cdba cdda cddb cdic cdii cgac cgcc cgcg ciaa ciak ciba cibc cibi cica cicc cici cida cidc cidg cidi ciga cigi ciia ciid ciii cika ckac ckbc ckbi ckck ckga daab daad daag daba dabb daca daci dada dadi daga dagg dagi daia daid daig daik daka daki dbag dbcc dcbc dcca dccb dccc dcci dcdb dcia dcii dddd dgac dgca dgia dgka dgkb dgkd dgkg dia- diab diac diad diag diak diba dibb dica dici dick dida didi diga digg digi diii dika diki dkba dkdc dkid gaba gabb gabi gack gada gadd gadi gadk gaga gagg gagi gaia gaid gaig gaki gbag gc-c gcaa gcbc gccc gcda gcic gcii gdca gdci gddb gggg giaa giac giad giai giba gibb gica gick gida gidc gidd gidi giga gigg gigi iaaa iaac iaai iaba iaca iacc iadb iadc iaia ibac ibad ibca ibga ibia ibid icaa icab icac icad icag icai icbc icbd icca iccb iccc icci icdc icdd icga icgc idad idca idda idia idic idid idig igac igad igba igbc igcc igga igia igkc iiac iica iicd iida iiii ikid ikig ikki k-ci k-id kaaa kaab kaag kaai kaak kaba kabb kabc kabd kabg kabi kacb kacc kacd kaci kad- kada kadd kadi kag- kaga kagb kagc kagg kagi kaia kaib kaic kaid kaig kaii kaik kaka kakc kaki kakk kbaa kbab kbac kbad kbai kbak kbba kbbb kbbc kbbd kbbg kbbi kbbk kbca kbcb kbci kbck kbdb kbdg kbdi kbga kbgb kbgg kbia kbib kbic kbid kbig kbik kbkb kbkg kbkk kcaa kcab kcac kcad kcai kcba kcbc kcbd kcbi kcbk kcca kccb kccc kccd kcci kcck kcda kcdc kcdd kcdi kcgc kcgi kcic kcid kcii kckc kckk kdaa kdab kdac kdad kdag kdai kdak kdbb kdbg kdbi kdca kdcc kdcd kddb kddc kddd kddg kddi kddk kdia kdic kdka kdkb kdkd kdkk kgab kgac kgak kgba kgbb kgbc kgcb kgcc kgcd kgdb kgdc kgdd kgga kggg kggi kgia kiab kiac kiad kiai kiba kibb kibc kibg kibi kica kicb kicc kicd kicg kick kida kidb kidd kidg kidi kidk kiga kigc kiia kiic kiid kiii kiik kika kikc kikd kiki kikk kkaa kkac kkag kkai kkba kkbb kkbd kkbg kkbi kkcb kkcd kkci kkck kkda kkdc kkdd kkdg kkgb kkia kkic kkid kkik kkkk