#include <iostream>
using namespace std;
int main() {
char ch1 = 'A';
char ch2 = 'B';
char ch3 = '\n';
cout << ch1 << '\t' << ch2 << ch3;
cout << 'C' << '\t' << 'D' << '\b' << ch1 << ch3;
//return 0;
}
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