a-ak aaaa aaab aaac aaad aaba aabb aabc aabd aabt aaca aacb aacc aacd aack aact aada aadc aadt aaka aata aatc aatk aatt abaa abab abac abad abak abat abb- abba abbb abbt abca abcb abcc abcd abct abda abta ac-t acaa acab acac acad acat acba acca accc accd acct acda acdb acdc acdt ackd acta actc actt adaa adab adac adad adak adat adba adbc adcc adda addc addd adta akaa akca akka at-t ataa atab atac atad atak atat atca atcc atck atdt atka atkt atta baaa baad baak baat baba babb bac- baca bacc back bact bada badb badd bak- baka bakt bata batc batt bbad bbbb bbdd bcaa bcat bcbc bcca bccc bcda bctc bdbc bddc btaa btcc btdt bttb c-cd caaa caab caac caat caba cac- caca cacc cack cada cadc cadd caka cat- cata catb catc catd catt cbac cbat cbbc cbca cbcc cbct cbdb cbdc cbka cbta cbtc ccaa ccab ccac ccad ccat ccba ccbc ccca cccb cccc ccdc cctb cctc cctt cdaa cdac cdad cdba cdda cddb ckac ckat ckbc ckck cktb ctab ctba ctca ctta daab daad daba dabb dabt daca dact dada daka data datt dbcc dbtt dcbc dcca dccb dccc dcct dcdb dctc dddd dkba dkdc dtaa dtac dtcc kaaa kaab kaak kaat kaba kabb kabc kabd kacb kacc kacd kact kad- kada kadd kadt kaka kakc kakk kakt kat- kata katb katc katd katk katt kbaa kbab kbac kbad kbak kbat kbba kbbb kbbc kbbd kbbk kbbt kbca kbcb kbck kbct kbdb kbkb kbkk kbta kbtb kbtc kbtk kbtt kcaa kcab kcac kcad kcat kcba kcbc kcbd kcbk kcca kccb kccc kccd kcck kcct kcda kcdc kcdd kckc kckk kcta kctb kctc kdaa kdab kdac kdad kdak kdat kdbb kdca kdcc kdcd kddb kddc kddd kddk kdka kdkb kdkd kdkk kdkt kdta kdtd kkaa kkac kkat kkba kkbb kkbd kkbt kkcb kkcd kkck kkct kkda kkdc kkdd kkdt kkkk kktc kktk ktaa ktak ktat ktba ktbb ktbc ktbt ktcc ktck ktdb ktdc ktdd ktdk ktkb ktkc ktkk ktkt kttc kttk kttt taa- taat taba tabb tabc taca tacc tack tact tada taka takk takt tata tatb tatt tbca tbcb tbcc tbcd tbta tcad tcca tccc tcdd tctc tdac tddb tkac ttab ttbb tttt