aaaa aaab aaac aaad aaba aabb aabc aabd aabt aaca aacb aacc aacd aact aada aadc aadt aata aatc aatt abaa abab abac abad 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 acta actc actt adaa adab adac adad adat adba adbc adcc adda addc addd adta at-t ataa atab atac atad atat atca atcc atdt atta baaa baad baat baba babb bac- baca bacc bact bada badb badd 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 cada cadc cadd cat- cata catb catc catd catt cbac cbat cbbc cbca cbcc cbct cbdb cbdc cbta cbtc ccaa ccab ccac ccad ccat ccba ccbc ccca cccb cccc ccdc cctb cctc cctt cdaa cdac cdad cdba cdda cddb ctab ctba ctca ctta daab daad daba dabb dabt daca dact dada data datt dbcc dbtt dcbc dcca dccb dccc dcct dcdb dctc dddd dtaa dtac dtcc taa- taat taba tabb tabc taca tacc tact tada tata tatb tatt tbca tbcb tbcc tbcd tbta tcad tcca tccc tcdd tctc tdac tddb ttab ttbb tttt