How does the letter grade system work?

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Imgur: The most awesome images on the Internet.
I played a simple 3v3 match, completely destroyed the other team. As you can see by the Screenshot above, my stats were great. Why did both of my teammates get an S and I did not? I just want to know the different factors that lead up to someone getting a letter grade. There's no way one death can bring that down, right? {{champion:203}}
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