Show that the following languages are not regular.

$($a$)\{$www $|$ w in $\{$a$,$ b$\}\}$

$($b$)\{0^$n $1^$m $0^$n $|$ n$,$ m $0\}$

$($c$)\{$w in $\{0,1\}|$ w is a palindrome$\}$

$($d$)\{$w in $\{0,1\}|$ w is not a palindrome$\}$