youtube links: <br />P1: <br />https://www.youtube.com/watch?v=0aGUOZsTYpc&list=TL2ENrXh2g3Zcyl4xhftr6PGsE3LcJVvYR <br />P2: <br />https://www.youtube.com/watch?v=GjZiAKG8vJU&index=8&list=TL2ENrXh2g3Zcyl4xhftr6PGsE3LcJVvYR <br />P3: <br />https://www.youtube.com/watch?v=d71PYShsCZE