[Starboard]

Could be writing styles. That’s one possible way.

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Yes, that and phraseology along with use of particular words and expressions. Tucker and company either have a hint as to who it is or they combined that with an examination of distinctive word patterns. We all tend to repeatedly rely on the use of certain words and phrases in our writing and speaking.

If its someone in the WH it shouldn’t be that hard to isolate them because of the extensive use of email and memos.

[Shethink13]

Could be writing styles. That’s one possible way.

Or could be someone from the WH that he's interviewed or spoken to previously saying the same things.

[Yaelle]

Tucker and company either have a hint as to who it is or they combined that with an examination of distinctive word patterns.

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That is how Ayers was found to have written the Autobiography of Barack Obama.