Finalized lab 3. Now in sysan.labs package there are two main classes:
SecondLab and ThirdLab. 
Usage: provide input in x[ij] and y[i] files and load them into list of
vectors (you can see how to do in my lab), also provide
dimensions of x[i]. 
You can also set how much polynomials to use, and which exactly (See
Usages and sysan.labs.polynomials.*)