41 Title: The imitation of static variables.
42 Title: Learn to use use auto-defined variables.
43 Title: imitate another case of static variables (static).
44 two rows of 3 by 3 matrix, to achieve its position corresponding to the sum, and returns a new matrix:
45 Title: statistics and 1-100 of.
46 Title: squaring the digital input, if less than 50 square operation exits.
47 Title: two variables exchanged.
48 Title: digital comparator.
49 Title: use lambda to create an anonymous function.
50 Title: outputting a random number.