15. (16th All-Russian Mathematics Competition) A desert is shaped like a half-plane, which is divided into many small squares of size $1 \times 1$. In the desert, 15 squares away from the boundary, there is a robot with energy $E=59$. The "energy consumption" of each small square is a natural number not greater than 5, and the "energy consumption" of any $5 \times 5$ square in the desert is 88. The robot can move into any adjacent small square (squares with a common side are considered adjacent), and each time it enters a square, its energy decreases by the energy consumption of that square. 

Will the robot be able to leave the desert?
Solve As shown in the figure, use routes with arrows to represent five different stubborn movement routes of the robot, * indicates the position of the robot.

The total energy consumption of the small squares passed by these five routes does not exceed $3 \times 88 + 2 \times 10 + 2 \times 5 = 294$ (the above routes pass through 3 squares of size $5 \times 5$ once, pass over the two adjacent squares above and below the robot's original position twice, and pass over the two adjacent squares above and below the robot's original position once).

Therefore, among these five different routes, there is at least one route where the total energy consumption of the small squares passed is less than 59, so the robot can move along this route to get out of the desert.