a-ak a-be aaaa aaab aaac aaae aaba aabb aabc aaca aacb aacc aace aack aaea aaec aaka aake abaa abab abac abae abaj abak abb- abba abbb abbe abca abcb abcc abec abee acaa acab acac acae acba acca accc acce ace- acea acec acek acke aeac aecb aeka ajab ajac ajak ajba ajee ajka akaa akae akca akee akka baaa baak baba babb babe bac- baca bacc bace back baek baja bak- baka bake bbbb bbeb bcaa bcbc bcca bccc bcec beak beba bebb bebe beca beck beeb beej beek beja beka beke bjcc bjec caaa caab caac caba cabe cac- caca cacc cace cack caec caja caka cake cbac cbbc cbca cbcc cbce cbea cbec cbee cbka cbkj ccaa ccab ccac ccba ccbc ccca cccb cccc ccee ceac ceba cec- ceca cece ceeb ceec ceja cejc ceke cjbc cjbk cjca cjcb cjcj ckac ckbc ckbe ckck eaba eaca eacc eaec ebac ebba ebbc ebcc ecaa ecac ecbc ecbe ecca eccb eccc ecce ecka eeca eeea eeee eeka eeke eka- ekab ekeb ekek ekka jaak jaba jaca jacc jace jack jaja jaka jake jbaa jcbc jccc jebb jebe jeke jjcc kaaa kaab kaak kaba kabb kabc kabe kacb kacc kace kaja kajb kajc kaje kajk kaka kakc kake kakj kakk kbaa kbab kbac kbae kbak kbba kbbb kbbc kbbe kbbk kbca kbcb kbce kbck kbeb kbec kbee kbek kbja kbjc kbjk kbkb kbkk kcaa kcab kcac kcba kcbc kcbk kcca kccb kccc kcck kcea kceb kcec kcee kcjb kcjc kcjj kcjk kckc kckj kckk kea- keak keba kebb kebc kebe keca keck keek kejb kejj keka kekb kekc keke kjaa kjac kjae kjak kjbb kjcb kjcc kjce kjck kjee kjjj kjjk kjke kjkj kjkk kkaa kkac kkba kkbb kkbe kkbj kkcb kkcj kkck kkea kkjb kkjk kkkj kkkk