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i was thinking the same thing. as i clicked on it i was like, why am i clicking on this, what is the allure of a question mark followed by peroids that sparks my interest? possibly the mystery of the thread? that thread could be about anything, you would never know! its alot to think about...
also, to op's question, i have no idea. i use pvc, it works well for me. <-(rhyme)
-retarded rant bumb