Mersenne: subtracting 2: error in FAQ

[Lucas Wiman]

All,
I recieved a message pointing out a possible error in my FAQ:

> Speaking of Q2.6, I've heard that with Crandall's DWT, the subtraction
> 2 step costs nothing at all.  It's done automatically within the
> transformation.  Try checking this with George Woltman.

Is this true?

-Lucas
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