Note: The following question follows a definite pattern. Observe the same and fill in the blank with suitable answer.
$$\frac{1}{a - b}, \frac{1}{a^{2} - b^{2}},\frac{1}{(a + b)^{2}(a - b)},\frac{1}{(a + b)^{2}(a^{2} - b^{2})},\frac{1}{(a + b)^{3}(a^{2} - b^{2})}$$
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