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I think this is a no-brainer call. Without reads in a 20+2 the limper could have anything and is very likely to fold, and the pusher is pushing many hands you dominate. You are ahead and have nice pot odds.

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My only concern here is that people commonly raise allin in these situations with pockets (77-JJ), maybe because they don't like playing the flop. I think your small stack makes this a definate push though.