using System;
public class Test
{
public static void Main()
{
string line = "123 Example Street Apt 1 City State, Zip";
int aptStartIndex = line.ToLower().IndexOf(" apt ");
int aptEndIndex = line.ToLower().IndexOf(" ", aptStartIndex + 5);
line = line.Substring(0, aptStartIndex) + line.Substring(aptEndIndex);
Console.WriteLine(line);
}
}
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