a-ak a-ha aaaa aaab aaac aaad aaah aaba aabb aabc aabd aabh aaca aacb aacc aacd aach aack aada aadc aaha aahk aaka abaa abab abac abad abak abb- abba abbb abca abcb abcc abcd abch abda abha acaa acab acac acad acba acca accc accd acch acda acdb acdc acha achh ackd adaa adab adac adad adah adak adba adbc adcc adda addc addd adha adhd ahab ahac ahad ahah ahha akaa akah akca akha akka baaa baad baah baak baba babb bac- baca bacc bach back bada badb badd badh baha bak- baka bakh bbad bbbb bbch bbdd bcaa bcbc bcca bccc bcda bchd bdbc bddc bddh bhca bhcc c-cd caaa caab caac caah caba cac- caca cacc cach cack cada cadc cadd caha caka cbac cbbc cbca cbcc cbdb cbdc cbha cbka ccaa ccab ccac ccad ccba ccbc ccca cccb cccc ccdc ccdh ccha cdaa cdac cdad cdba cdda cddb chaa chab chac chad chah chak chca chch chha chka chkb ckac ckbc ckch ckck daab daad daba dabb daca dada daha daka dbcc dcbc dcca dccb dccc dcdb dddd dhaa dhad dhak dkba dkdc haab haad haak haba hack hada hadh haha haka hakk hbcd hcbc hcca hccb hccc hcch hdbk hdca hdda hhaa hhhh hkcc kaaa kaab kaak kaba kabb kabc kabd kacb kacc kacd kach kad- kada kadd kaha kahc kaka kakc kakh kakk kbaa kbab kbac kbad kbak kbba kbbb kbbc kbbd kbbk kbca kbcb kbch kbck kbdb kbhb kbhc kbhh kbkb kbkk kcaa kcab kcac kcad kcah kcba kcbc kcbd kcbk kcca kccb kccc kccd kcck kcda kcdc kcdd kcha kchh kchk kckc kckk kdaa kdab kdac kdad kdak kdbb kdca kdcc kdcd kddb kddc kddd kddk kdka kdkb kdkd kdkk khab khac khad khak khbc khbd khca khcb khcc khch khck khdc khdk khhk khka khkk kkaa kkac kkba kkbb kkbd kkcb kkcd kkch kkck kkda kkdc kkdd kkha kkhb kkhh kkhk kkkk