#include <iostream>
using namespace std;
#define A
#define B
int main() {
#ifdef A
std::cout << "a ";
#endif
#ifdef B
std::cout << "b ";
#endif
#ifdef C
std::cout << "c ";
#endif
#ifdef B C
std::cout << "bc ";
#endif
#ifdef C B
std::cout << "cb ";
#endif
return 0;
}
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