Exercise 4 Suppose there are three variables X, Y, and Z with these types: X: integer that is divisible by 3 Y: integer that is divisible by 12 Z: integer For each of the following assignments, knowing nothing about the values of the variables except their types, answer whether a language system can tell before run- ning the program whether the assignment is safe? Why or why not? a. X = Y b. X = X c. Y := y + 1 d. Z : = X e. X : = Z f. X = X + 3 8. X : = X + Y

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