a-ak a-be aaaa aaab aaac aaad aaae aaba aabb aabc aabd aaca aacb aacc aacd aace aack aada aadc aade aaea aaec aaka aake abaa abab abac abad abae abak abb- abba abbb abbe abca abcb abcc abcd abda abec abed abee acaa acab acac acad acae acba acca accc accd acce acda acdb acdc acde ace- acea acec aced acek ackd acke adaa adab adac adad adae adak adba adbc adcc adda addc addd adde adea adeb adee aeac aecb aede aeka akaa akae akca aked akee akka baaa baad baak baba babb babe bac- baca bacc bace back bada badb badd bade baed baek bak- baka bake bbad bbbb bbdd bbeb bcaa bcbc bcca bccc bcda bcde bcec bdbc bddc bead beak beba bebb bebe beca beck beda bede beeb beed beek beka beke c-cd caaa caab caac caba cabe cac- caca cacc cace cack cada cadc cadd cade caec caka cake cbac cbbc cbca cbcc cbce cbdb cbdc cbea cbec cbee cbka ccaa ccab ccac ccad ccba ccbc ccca cccb cccc ccdc cced ccee cd-e cdaa cdac cdad cdba cdda cddb cdec ceac cead ceba cec- ceca cece ceda cedd cede ceeb ceec ceke ckac ckbc ckbe ckck daab daad daae daba dabb daca dace dada dade daeb daka dake dbcc dcbc dcca dccb dccc dcdb dddd deac dead deae deak deba debe dec- deca decc decd dece deck deda dedd dede deeb deed deek dek- deka deke dkba dkdc eaba eaca eacc eada eadb eadd eaec ebac ebba ebbc ebcc ebed ecaa ecac ecad ecbc ecbe ecca eccb eccc ecce ecdc eced ecka edac edad edca edda eddc edde ede- edea eeca eede eeea eeee eeka eeke eka- ekab ekeb eked ekek ekka kaaa kaab kaak kaba kabb kabc kabd kabe kacb kacc kacd kace kad- kada kadd kade kaka kakc kake kakk kbaa kbab kbac kbad kbae kbak kbba kbbb kbbc kbbd kbbe kbbk kbca kbcb kbce kbck kbdb kbde kbeb kbec kbed kbee kbek kbkb kbkk kcaa kcab kcac kcad kcba kcbc kcbd kcbk kcca kccb kccc kccd kcck kcda kcdc kcdd kcea kceb kcec kced kcee kckc kckk kdaa kdab kdac kdad kdae kdak kdbb kdca kdcc kdcd kdce kddb kddc kddd kddk kdeb kdec kdka kdkb kdkd kdkk kea- kead keak keba kebb kebc kebe keca keck keda kedb kedc kedd kede keed keek keka kekb kekc keke kkaa kkac kkba kkbb kkbd kkbe kkcb kkcd kkck kkda kkdc kkdd kkea kked kkkk