The most important thing to know about duplicate threads is not to get intimidated by their sheer numbers. In reality, they are easily navigated. Even a child can conquer them. Just go here:
Table of Contents - Your Guide to Duplicate Threads
If the above does not clear up all your questions, feel free to seek out these main research sources:
Obsession …Dude enough is enough.
The "one word only" thread
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Thread: Duplicate threads for Dummies