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Functions $F(a, b)$ and $G(a, b)$ are defined as follows:
$F(a, b) = (a − b)^2$ and $G(a, b) = \mid a − b\mid$, where $\mid x \mid$ represents the absolute value of $x$.

What would be the value of $G(F(1, 3), G(1, 3))$?

  1. $2$
  2. $4$
  3. $6$
  4. $36$
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