Parametrization of Pythagorean triplets

Fill the parentheses with a positive integer:

323^2 is a perfect square.

32+423^2+4^2 is a perfect square.

32+42+1223^2+4^2+12^2 is a perfect square.

32+42+122+(    )23^2+4^2+12^2+ (\ \ \ \ )^2 is a perfect square.

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