 and he collects some data. After he collects those data, he's going to build a mathematical model. When he builds that mathematical model, he solves the mathematical model and he compares it with the data that he collected. If there is an agreement, he will be able to predict what will happen in the future. So he will be able to advise the government about what will happen in the future according to the parameter of input that he's going to put in his model. So prediction going towards the future, trying to see what is going to happen there, we use mathematics to do that.