//set union
public static VALL operator +(VALL L1, VALL L2)
{
VALL L = VALL.Clone(L1);
foreach (VAL v in L2.list)
{
L.list.Add(VAL.Clone(v));
}
return(L);
}
//set complmentary
public static VALL operator -(VALL L1, VALL L2)
{
VALL L = VALL.Clone(L1);
for (int i = 0; i < L1.list.Count; i++)
{
if (L2.list.Contains(L1.list[i]))
{
L.list.Remove(L1.list[i]);
}
}
return(L);
}