Once Calvin and his friends were very hungry and they decided to go to the McDonalds to satisfy their craving.

In the McD menu, there were 4 burgers mentioned: McVeggie, McChicken, Chicken Maharaja - Mac, and Filet-o-Fish.

If Calvin ordered 10 burgers in total, in how many ways can Calvin buy the burgers? Note that the order does not matter.

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