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The impulse response $g(t)$ of a system, $G$, is as shown in Figure $(a)$. What is the maximum value attained by the impulse response of two cascaded blocks of $G$ as shown in Figure $(b)$?

1. $\frac{2}{3}$
2. $\frac{3}{4}$
3. $\frac{4}{5}$
4. $1$

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