Write the following sets in roster form :
a) $\{n\in\mathbb N | 1<n\leq 8\}$
b) $\{n\in\mathbb N | n\in [-4,4]\}$
c) $\{n\in\mathbb N | n^2\leq 64\}$
d) $\{n\in\mathbb Z| |n|<\sqrt{5}\}$
e} $\{n\in\mathbb Q| n=-n\}$