Some of the operations in standard programming languages can be modeled as actions that change the state of the world. For example, the assignment operation changes the contents 

of a memory location; the print operation changes the state of the output stream. A program consisting of these operations can also be considered as a plan, whose goal is given by the 

specification of the program. Therefore, planning algorithms can be used to construct programs that achieve a given specification. 

a. Write an operator schema for the assignment operator (assigning the value of one variable to another). 

b. Show how object creation can be used by a planner to produce a plan for exchanging the values of two variables using a temporary variable.

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