The notion that one or more of the Whitechapel murders were copy-cat killings is immensely popular in some quarters, and so I would like to ask those people the following three quick questions.

1) Which of the 11 Whitechapel murders do you believe are copy cat killings.
2) What exactly did the killer copy in that instance.
3) Where did the killer gain the information from, which enabled him/her to do the actual copying?

Thanks in advance.