$\{$a$$ b$|$ n $>=0\}$

$\{$a$$ b$$ c$|$ n $>=0\}$

$\{$a$$ b$$ c$|$ n $>=0\}$

$\{$a$$ b$$ c$|$ n $>=0\}$

$\{$a$$ b$$ c$$ d$|$ n $>=0\}$

$\{$a$$ b$$ c$$ d$|$ n $>=0\}$

$\{$a$$ b$$ c$$ d$|$ n $>=0\}$

$\{$s $|$ s $=$ ww$,$ where w in $\{0,1\}*\}$

$\{$s $|$ s $!=$ ww$,$ where w in $\{0,1\}*\}$

$\{$ww$|$ w in $\{0,1\}*\}$

$\{$w$011$w$|$ w in $\{0,1\}*\}$

which one is not context free?