As you do not care about what case a word is in, you create the corpus out of the content, which is all lowercase.
In the following example, a function returns the successive lowercase characters of a string.
This loop will create 26 documents, one for each lowercase letter of the alphabet, each document containing the character itself and its ASCII character code.
The key should be as random a string as you can concoct, with numbers and uppercase and lowercase letters.
In bond(the“b”is lowercase in deference to 007 copyright lawyers)，U．K．－based Decca Records has found its own variation of Sex in the Symphony．
