a-ya aaaa aaab aaac aaad aaba aabb aabc aabd aaby aaca aacb aacc aacd aacy aada aadc abaa abab abac abad abay abb- abba abbb abby abca abcb abcc abcd abda abdy abyc abyy acaa acab acac acad acba acca accc accd accy acda acdb acdc adaa adab adac adad aday adba adbc adcc adda addc addd addy adya ayad ayay ayca ayda ayya baaa baad baba babb baby bac- baca bacc bada badb badd bady baya bbad bbay bbbb bbdd bcaa bcbc bcca bccc bcda bday bdbc bddc byyd c-cd caaa caab caac caba caby cac- caca cacc cada cadc cadd cady cbac cbbc cbca cbcc cbdb cbdc ccaa ccab ccac ccad ccba ccbc ccca cccb cccc ccdc cdaa cdac cdad cday cdba cdda cddb cya- cyaa cyba cybb cybc cyc- cyca cycb cycc cyy- cyyc daab daad daba dabb daca dada dady daya dbcc dc-y dcbc dcca dccb dccc dcdb dday dddd dya- dyab dyac dyad dycd dydd yaba yacc yacy yada yaya ycab yccc ydad yday yyyy