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Although your read on the button raiser is probably spot on...the odds are that he is raising here with much less than 99. The size of the raise should indicate that he's not that strong here as well. Why raise to 5x the blind when any raise...ie: T4500-T6000 would easily steal here?
In general, the bigger the raise from the button, the weaker the he is. Unless this guy is REALLY smart...in other words he would make a deliberate overbet from the button, knowing that you would read him as being weak, you have to reraise here. If he then comes back over the top of you...you have a tough decision.

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Actually, a 4x raise is always a stronger than average hand. So a 5xR can only mean A's.