Suppose a function is given by the following table of values.
 -3  -2  -1  0  1  2  3 
 0  -1  -1  0  -2  -2  -4 

Use the table to fill in the missing values. There may be more than one correct answer, in which case you should enter your answers as a comma separated list. If there are no correct answers, enter NONE. help (numbers)

You can earn partial credit on this problem.