Let $L=\{\begin{array}{c}?\end{array}$ ucv: where uin$\{a,b{\}}^{+}$and vin$\{a,b{\}}^{+}$and $\{$:$|u|=|v|\}$ where $=\{a,b,c{\}}^{+}$is

the alphabet for $L.$

a$.$ Find a context$-$free grammar for $L.$

b$.$ Use your grammar to give a leftmost derivation of $w=$ abacaab

Edit View Insert format Tools Table

$12ptvv$ Paragraph $vv|B,I{?}_A{?}_{v}v{}_{v}v{T}^{2}vv|vdots$