Each regular wave induces me a response, regular response, add them up. So, you break
it down, go add them up, this is a picture that must to clear in your mind. Because, it is
getting here to here appears very confusing, not correlated as if you know, there it is very
confusing, but it is actually that, this is the most simplest thing, this part and this part is
pure nothing, but algebra, just you cannot make mistake unless in a in a typing mistake
type, there is no hydrodynamic mistake in there, hydrodynamic comes finding out in a
single wave what is the response, which is what we talked so far.