2/4 Check-up Flopping the Nuts and not even considering FPS lines

[crunchy1]

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A key factor that is missing from the discussion of this hand is the range of hands that MP is limping with here. Put him on a range of hands that any average player will limp, first-in with from MP. You'll quickly see why raising PF is the correct play.

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Completely wrong at a limit like 2/4. You have to be suggesting that his chances of having a hand like K4s are skyrocketing because of this and that is totally bogus.

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Why completely wrong? Why because it's 2/4?

And I'll still appreciate your answer to the following:

What is the range of hands you are putting MP on when he limps, first-in?