a-ak a-be a-ha aaaa aaab aaac aaae aaah aaba aabb aabc aabh aaca aacb aacc aace aach aack aaea aaec aaha aahk aaka aake abaa abab abac abae abak abb- abba abbb abbe abca abcb abcc abch abec abee abha acaa acab acac acae acba acca accc acce acch ace- acea acec aceh acek acha ache achh acke aeac aecb aeka ahab ahac ahah ahha akaa akae akah akca akee akha akka baaa baah baak baba babb babe bac- baca bacc bace bach back baek baha bak- baka bake bakh bbbb bbch bbeb bcaa bcbc bcca bccc bcec bche beah beak beba bebb bebe beca bech beck beeb beek beka beke bhca bhcc caaa caab caac caah caba cabe cac- caca cacc cace cach cack caec caha cahe caka cake cbac cbbc cbca cbcc cbce cbea cbec cbee cbha cbka ccaa ccab ccac ccba ccbc ccca cccb cccc ccee ccha cche ceac ceba cec- ceca cece ceeb ceec ceke chaa chab chac chae chah chak chca chce chch chea cheb chec chee cheh chek chha chka chkb ckac ckbc ckbe ckch ckck eaba eabh eaca eacc each eaec ebac ebba ebbc ebcc ecaa ecac ecbc ecbe ecca eccb eccc ecce echa eche ecka eeca eeea eeee eeka eeke ehaa ehcc ehea eheh eka- ekab ekch ekeb ekek ekka haab haak haba habe hace hack haec haha haka hake hakk hcbc hcca hccb hccc hcch heah hebb hebe heca hech heck heeb heek hehe heka heke hhaa hhhh hkcc kaaa kaab kaak kaba kabb kabc kabe kacb kacc kace kach kaeh kaha kahc kahe kaka kakc kake kakh kakk kbaa kbab kbac kbae kbak kbba kbbb kbbc kbbe kbbk kbca kbcb kbce kbch kbck kbeb kbec kbee kbeh kbek kbhb kbhc kbhe kbhh kbkb kbkk kcaa kcab kcac kcah kcba kcbc kcbk kcca kccb kccc kcck kcea kceb kcec kcee kcha kche kchh kchk kckc kckk kea- keak keba kebb kebc kebe keca kech keck keeh keek kehk keka kekb kekc keke khab khac khak khbc khca khcb khcc khch khck kheb khec khhk khka khke khkk kkaa kkac kkba kkbb kkbe kkcb kkch kkck kkea kkha kkhb kkhh kkhk kkkk