Well - not to brag but you're right :-) I'm just having one of those days today where these things keep popping out of my fingers on computer and mouth otherwise. I better get a handle on it before games tonite!

[With A shooting] B is entitled/supposed to occupy the first lane spaces. A may occupy the second. If A declines, then B can take the second space.

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No, he didn't. Preventive and preventative have the same meaning. In fact, it's basically the same word.

http://dictionary.reference.com/browse/preventive