Exercise 2.3 a) Look up the definition of the list data structure in Python. Give two examples of lists in Python. [4 points] b) Similar to what we did in class for the C Union data structure (see the class notes), write EBNF (or BNF) descriptions for a list data structure in Python. The level of detail could be similar to the Union example. It's fine to keep simple and just choose two data types that will be inside the list. Allow lists within lists. (hint: You do not need to show this, but to convince yourself that you are writing the EBNF properly, the EBNF description should be able to generate examples such as the ones that you have in (a)) [3 points]