From: "Bruce D. Wedding" 

> > 4. Multiply x by 7 without using multiplication (*) operator.
>
> x = (x << 3) - x;

I like that Roger.  I had done this less clever solution:

x = (x << 2) +( x << 1) +  x;

I'm working on the "remove dupes from array" problem.  And I
think people missed the one about f(7) = 4 and f(4) = 7.  It said show FOUR
ways to do that.

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