a-be aaaa aaab aaac aaad aaae aaaf aaba aabb aabc aabd aaca aacb aacc aacd aace aacf aada aadc aade aaea aaec aafa aafb aafc aafd aaff abaa abab abac abad abae abaf abb- abba abbb abbe abca abcb abcc abcd abcf abda abec abed abee abff acaa acab acac acad acae acba acca accc accd acce accf acda acdb acdc acde acdf ace- acea acec aced acfc acfd acfe adaa adab adac adad adae adba adbc adcc adda addc addd adde adea adeb adee adfa adfc aeac aeaf aecb aede afaa afad afca afcb afcc afdb afdc afee affa affc baaa baad baaf baba babb babe bac- baca bacc bace bada badb badd bade baed bafc baff bbad bbbb bbdd bbeb bbfc bcaa bcbc bcca bccc bcda bcde bcec bcfc bdbc bddc bead beaf beba bebb bebe beca beda bede beeb beed beef befa befe beff bfca c-cd caaa caab caac caaf caba cabe cabf cac- caca cacc cace cada cadc cadd cade caec cafa cafb cafc cafe caff cbac cbbc cbca cbcc cbce cbdb cbdc cbea cbec cbee cbef cbfb cbfc ccaa ccab ccac ccad ccaf ccba ccbc ccca cccb cccc cccf ccdc ccdf cced ccee ccfa ccfc ccfd ccff cd-e cdaa cdac cdad cdba cdbf cdda cddb cdec cdef cdfa cdfe ceac cead ceba cec- ceca cece ceda cedd cede ceeb ceec cef- cefa cefc cfaa cfab cfac cfae cfbc cfca cfcb cfcf cfda cffb daab daad daae daba dabb daca dace dada dade daeb dafa dafc dafe daff dbcc dbfc dcbc dcca dccb dccc dcdb dcfc dddd deac dead deae deaf deba debe dec- deca decc decd dece deda dedd dede deeb deed deef defe deff dfaf dfcc dffa eaaf eaba eaca eacc eada eadb eadd eaec eafb ebac ebba ebbc ebcc ebed ebfc ecaa ecac ecad ecbc ecbe ecca eccb eccc ecce ecdc ecdf eced ecef ecfa ecfc edac edad edca edda eddc edde ede- edea edfa eeca eede eeea eeee eefa eefe efab efca efda effa faaa faac faad faba fabd fabe faca facc face fada fadd fade faeb fafa fafc fafe faff fcab fcba fcca fccf fcda fdca fead feaf feba fece feda fede feeb feed fefc fefe feff ffcc ffee ffff