#include <iostream>
using namespace std;
typedef struct {
// const
double LN20;
double LN40;
// methods
double NoteToFrequency(int noteNumber);
} Tool;
extern const Tool tool;
const Tool tool {1.34, 3.14};
int main() {
cout << tool.LN20 << ' ' << tool.LN40 << '\n';
return 0;
}
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