public static Variable print(Variable v)
{
Console.WriteLine(v.toString());
return v;
}
public override vBase substitution(Variable v)
{
x = v.toString(); return this;
}
public override bool eq(Variable v)
{
return x == v.toString();
}
public override bool ne(Variable v)
{
return x != v.toString();
}
public override void add(Variable v)
{
x += v.toString();
}