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$4.5 is a PSB - so is plenty fine - AK being the 2nd nuts preflop (effectively) we wanna get lots in pre if we can.

You can't tell whether or not to CB just from the "trinity" numbers they are mostly to do with preflop. In PAHUD there's the "fold to CB%" stat thats useful here.

In fact I CB for ~$6 here almost always and fold to a raise (shutdown to a call) he calls preflop with a wiiiiiiiiide range and that flops not helped much of it.