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public string Intersection(string strA, string strB)
{
string strC="";
int iLength=strA.Length;
int iSubLength = 0;
for (int i = 0; i < iLength; i++)
{
for (int j = 0; j <= iLength - i; j++)
{
if (strB.IndexOf(strA.Substring(i, j)) > 0)
{
if (strA.Substring(i, j).Length > iSubLength)
{
strC = strA.Substring(i, j);
iSubLength = strC.Length;
}
}
}
}
return strC ;
}