// constructor that performs a deep copy of another LetterSet object
public LetterSet(LetterSet LetterSetWeWantToCopy)
{
letterIsSet = (LetterSetWeWantToCopy.Copy()).letterIsSet;
}
// LetterSet Tester
static void Main(string[] args)
{
LetterSet test1 = new LetterSet();
LetterSet test2 = new LetterSet("God said let there be light!");
LetterSet test3 = new LetterSet();
LetterSet test4 = new LetterSet(test2);
LetterSet test5 = new LetterSet("abcdefghijklmnop");
LetterSet test6 = new LetterSet("hijklmnopqrstuv");
LetterSet test7 = new LetterSet("qrstuvwxyz");
LetterSet test8 = new LetterSet(test5);
Console.WriteLine(test1);
Console.WriteLine(test2);
Console.WriteLine(test3);
Console.WriteLine(test4);
Console.WriteLine("");
test1.Insert("Z");
test2.Insert("z");
Console.WriteLine(test1);
Console.WriteLine(test2);
Console.WriteLine(test3);
Console.WriteLine(test4);
Console.WriteLine("");
test1.Remove("rz");
test2.Remove("rZ");
Console.WriteLine(test1);
Console.WriteLine(test2);
Console.WriteLine(test3);
Console.WriteLine(test4);
Console.WriteLine("");
test1 = test2.Copy();
test3 = test2.Copy();
Console.WriteLine(test1);
Console.WriteLine(test2);
Console.WriteLine(test3);
Console.WriteLine(test4);
Console.WriteLine("");
Console.WriteLine("\nNow we shall test the unions and intersections!\n\nIntersect 5 and 6:");
Console.WriteLine(test5.Intersect(test6));
Console.WriteLine("\nIntersect 6 and 7");
Console.WriteLine(test6.Intersect(test7));
test5 = test8.Union(test6).Union(test7);
Console.WriteLine("\nUnion 6, 7, and 8; store value in 5 and make sure 8 did not change:");
Console.WriteLine(test5);
Console.WriteLine(test8);
Console.WriteLine("");
}