How would you play this one?

[scotty34]

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raise preflop, given the limp you call the 3bet easy

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Ok, I've seen this in a few responses (along with "never limp in MP"). What is the play if you have 22? If its different, where is the line drawn?

Is limping OK if you see the 4 left to act behind you are all quite loose, and not likely to fold to a raise? (at least one of them was not likely to fold in this case)