What's the output of this code?
x = [1, 2, 3, 4]
y = [i**2 for i in x]
y = [1, 4, 9, 16]
Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
What's the output of this code?

### Response:
y = [1, 4, 9, 16]