Oh yes, I remember it well.

A solution to get the problem off, have you found it? Really? What kind of solution do you resolve the problem? From what sources? Well, there are so many questions that we utter every day. No matter how you will get the solution, it will mean better. You can take the reference from some books. And the ah yes i remember it well is one book that we really recommend you to read, to get more solutions in solving this problem.