Shipping Multiple Items: Shipping Rate

I'm trying to build a small commerce store on my website.  Shipping for each item individually is $6, but combined would be $10 to ship both.  How do I implement this sort of scheme into my shipping?  Even though I have both items currently set at $6 each, when I added both items to the cart, it said that the shipping was only going to be $6.  Thanks for your help! : )

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