/// <summary>
/// Add a rule substituting one word for another
/// </summary>
/// <param name="a"></param>
/// <param name="b"></param>
internal void AddSubstitution(string a, string b)
{
subs.Add(a, b);
}
/// <summary>
/// Add a rule substituting one word for another
/// </summary>
/// <param name="a"></param>
/// <param name="b"></param>
internal void AddSubstitution(string a, string b)
{
subs.Add(a, b);
}