Read sections 1.1-1.4 Do problems:
(1.1) 4cfh, 8ce, 16acde, 22bc, 24ace, 46 (1.2) 6, 8cd, 10cd, 18, 40, 42, 48, 52 (1.3) 6ace, 10ace, 36bce, 46, 58bcd