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Just see these two questions:

First: How to retrieve yahoo contact in Android?

A same user asked two questions with the same title.

Title of both questions (before the revision):

  1. How to retrieve yahoo contact in Android?
  2. How to retrieve yahoo contact in Android ?

(only difference is that space between Android and ?).

A user tried to improve the post (only body and not title) but he got this error message:

enter image description here

If someone get this error while editing a question then how can a user ask a question with the same title? (In other words if space difference is not considered while editing then why it is considered while asking?)

share|improve this question
Related, my answer basically demonstrates this. A simple win is to lower case everything and strip out punctuation when making thw check. – ben is uǝq backwards May 4 '13 at 12:39

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