Please identify each problem as shown here, with a two-letter code prefixing the exercise number.
TP15.1, that is, exercise 1 in chapter 15 of Think Python
TP15.2, that is, exercise 2 in chapter 15 of Think Python
TP17.2, that is, exercise 2 in chapter 17 of Think Python
TP17.3, that is, exercise 3 in chapter 17 of Think Python. Do not assume the coordinates are integers.
CA13.1, that is, Exercise 13.1 in Chapter 13 of Concrete Abstractions, which appears on page 424.
CA13.3, that is, Exercise 13.3 in Chapter 13 of Concrete Abstractions, which appears on page 428.