Question
class Program
{
static void Main(string[] args)
{
String []chars = {"z", "x", "y", "z", "y"};
for (int i = 0; i < chars.Length; ++i)
for (int j = i + 1; j < chars.Length; ++j)
if(chars[i].CompareTo(chars[j]) == 0)
Console.WriteLine(chars[j]);
Console.ReadLine();
}
}a.
zx
b.
xy
c.
zy
d.
yz
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