Page numbers are for draft copy at present; they will be replaced with correct numbers when final book is formatted. Chapter numbers are correct and will not change now.
A magic square is a square grid of numbers, typically consecutuve, where each row, column and sometimes diagnonal add up to the same number.
Used in Chap. 4: pages 39, 40, 41, 43, 45, 53, 58, 59; Chap. 11: page 160
