import java.util.*;
import java.lang.*;
class Main
{
{
int a = 0b1001;
a = xor(a, 0b0100); // flip third LSB
a = xor(a, 0b0100); // flip it back
}
static int xor(int p, int q) {
return (p & ~q) | (~p & q);
}
}
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