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Using multiple lists in a function is no different from just using multiple arguments in a function!

a = [1, 2, 3]
b = [4, 5, 6]
print a + b
# prints [1, 2, 3, 4, 5, 6]

The example above is just a reminder of how to concatenate two lists.

Create a function that joins two lists together.

On line 5, define a function called join_lists that has two arguments, x and y. They will both be lists.
Inside that function, return the result of concatenating x and y together.

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