Your action?

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Not sure why would not bet you have 18 outs and you could still have the best hand as well....

I would imagine that this is a trick question though...since it seems so obvious to bet. The only reason that I could think of for checking, is then most Tag's would not think you had a heart or an ace and basically bet the river no matter what comes. If your one of your cards comes, you can raise the river and if it does not come...you can fold....and get out cheaply. Still like betting better.