脑子一抽想出的构式数据~~(结果为27)~~

A
AB ABC ABCD
ABCDE
ABCDEF
ABCDEFG
ABCDEFGH
ABCDEFGHI
ABCDEFGHIJ
ABCDEFGHIJK
ABCDEFGHIJKL
ABCDEFGHIJKLM ABCDEFGHIJKLMN ABCDEFGHIJKLMNO ABCDEFGHIJKLMNOP ABCDEFGHIJKLMNOPQ
ABCDEFGHIJKLMNOPQR ABCDEFGHIJKLMNOPQRS ABCDEFGHIJKLMNOPQRST ABCDEFGHIJKLMNOPQRSTU ABCDEFGHIJKLMNOPQRSTUV ABCDEFGHIJKLMNOPQRSTUVW ABCDEFGHIJKLMNOPQRSTUVWX ABCDEFGHIJKLMNOPQRSTUVWXY ABCDEFGHIJKLMNOPQRSTUVWXYZ