To verify that a string of characters belongs to a language defined by a grammar, we must create a parse tree that shows that the string can be generated by the grammar.

Consider the following grammar:

 ->  ,  |   ->    |    -> A| B | C  -> x | y | z 

Choose a string that is in this language and create a parse tree that demonstrates that your claim is true. Identify another string that contains some of these terminals symbols but is not in the language.