Exercise 3 Use the function design recipe to develop a function named unique_list. The function takes a list of strings, which may be empty. The function returns a new list that includes the first...

Extracted text: Exercise 3 Use the function design recipe to develop a function named unique_list. The function takes a list of strings, which may be empty. The function returns a new list that includes the first occurrence of each value in a list and omits later repeats. The returned list should include the first occurrences of values in a list in their original order. For example, if a list contains the following animals ['cat', 'dog', 'cat', 'bug', 'dog', 'ant', 'dog', 'bug'], the unique_list function returns a unique list: ['cat', 'dog', 'bug', 'ant'].