2. there is a dot between 0 and A. 3. derive some examples then try to describe the pattern. talk less about the phrase regular grammar, explore more about the meaning, like if derivation gives a set {cat, dog, ...} , you can guess this set is about animals

2. List some legal inputs of grammar G. Try to describe the same language in some other ways. (1) S0.A (2) A3A3 3. Describe the pattern of this language and try to name it: SSSS+a