Chapter 13.1, Problem 16E

Construct phrase-structure grammars to generate each of these sets.

a) $\left\{1^n|n\ge \text{0}\right\}$

b) $\left\{1{\text{0}}^n|n\ge \text{0}\right\}$

c) $\left\{{\left(11\right)}^n|n\ge \text{0}\right\}$