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1. In Project 2, you probably did not represent objects in your 
race course as pointers. How will the grid of the race course represented
now? How will you retrieve the pointer to the "bumpee"?


2. A Thing object stores its position in its data members m_row and
m_col. The race course also stores pointers to Things that can be
retrieved given the position. Thus, the position of a Thing is
stored in two different places. When could you check that these two
pieces of information are consistent?


3. Will you have any appendant (non-inherited) data members in Car?
If not, where is the fuel level stored? If so, should these members
be public, private or protected? Why?