#include <iostream>
using namespace std;
#define func1(x, y) ((x + y) * (x - y))
inline int func2(int x, int y) {
return (x - y) * (x + y);
}
int func3(int x, int y) {
return func1(x, y);
}
int main() {
cout << func1(5, 4) << endl;
cout << func2(5, 4) << endl;
cout << func3(5, 4) << endl;
return 0;
}
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