Write a CFG $($Context$-$free Grammar$)$ for the following languages. L$=$fa$^\{$m$\}$b$^\{$n$\}$c$^\{$m$\}$d$^\{$m$\}$ n$>=1,$ m$>=1)$ U $(($b$^\{$m$\}$c$^\{$m$\}$d$^\{$n$\}$ : n$>=1,$ m$>=1)$

b$)\backslash$frac$\{($a$\backslash$cup b$)^\{*\}$b$($a$\backslash$cup b$)*$a$($a$\backslash$cup b$)*\}\{\backslash$beta$\}$