Suppose $=\{a,b\}$ and you have two given grammars, G $1$ and G $2$ :

G$1$ has productions $S$ aas $|bbS|,$ where $S$ is the start symbol.

$G2$ has productions $T$ abT $||$ baT $||,$ where $T$ is the start symbol.

You can combine G$1$ and G$2$ into a new grammar that contains all the productions that are either in G$1$ or G$1$ and adding a new start symbol R and the productions R $S|T|.$

Which of the following strings can $G$ generate?

bbab

abaa

$$

abbb