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class circle
{
static double PI=3.14;
double r = 0.0;
public circle(double r) {this r = r;}
public double area() {return PI*this.r*this.r}; //ok
public static double area(Circle c) {return PI*c.r*c.r}; //ok
public static double area2(Circle c) {return PI*r*r}; //error
}