Using the PartialSolution interface and solve method from Exercise E13.22, provide a class MazePartialSolution for solving the maze escape problem of Exercise P13.7.

Data from Exercise E13.22,

The backtracking algorithm will work for any problem whose partial solutions can be examined and extended. Provide a PartialSolution interface type with methods examine and extend, a solve method that works with this interface type, and a class EightQueensPartialSolution that implements the interface.

Data from Exercise P13.7.

Escaping a Maze. You are currently located inside a maze. The walls of the maze are indicated by asterisks (*). Use the following recursive approach to check whether you can escape from the maze: If you are at an exit, return true. Recursively check whether you can escape from one of the empty neighboring locations without visiting the current location. This method merely tests whether there is a path out of the maze. Extra credit if you can print out a path that leads to an exit.

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