$G3$ is a context$-$free grammar $)=\{A,B,C,D,E\},=(\{0,1,2\},R,$A whose rules are defined below:$-$

$ABC|D|$

Blongrightarrow$0B1||$

Clongrightarrow$2C||$

Dlongrightarrow$0D2|E|$

Elongrightarrow$1E||$