You are going to act as a Python interpreter. You will be given a valid python program below. Write down what you think the result of its execution would be. Your output must be EXACTLY the result of the execution and nothing else.
situation
system
import re

# input string
string = "In the morning, the sun rises in the east and sets in the west. In the evening, the stars come out and shine in the night sky. The moon rises in the east and sets in the west."

words = string.split(" ")

# set that contains the frequnt phrases
phrases = set()

# loop over the words in the string
for index, word in enumerate(words):
    # loop over the words ahead of the current word
    for ahead in range(index+1, min(index+4, len(words))):
        # check if the phrase exists in the string
        if " ".join(words[index:ahead+1]) in string:
            # add the phrase to the set
            phrases.add(" ".join(words[index:ahead+1]))

# print the phrases
print(phrases)
user
{'the sun rises', 'the stars come out', 'stars come', 'the morning,', 'stars come out', 'morning, the sun', 'sun rises', 'the evening, the stars', 'and shine in the', 'sun rises in the', 'In the morning,', 'the east', 'the sun rises in', 'rises in', 'east and sets in', 'east and sets', 'sets in the', 'sets in the west.', 'the sun', 'in the west. In', 'the west. In', 'the west. In the', 'the west.', 'and shine in', 'night sky. The moon', 'sky. The moon', 'The moon rises', 'the stars', 'the evening, the', 'in the west.', 'in the east and', 'The moon', 'in the east', 'morning, the sun rises', 'rises in the', 'the morning, the sun', 'In the', 'west. In', 'night sky.', 'and shine', 'evening, the', 'evening, the stars come', 'shine in the', 'the stars come', 'shine in', 'the east and sets', 'and sets', 'west. In the evening,', 'come out', 'the morning, the', 'the evening,', 'come out and', 'east and', 'in the night', 'the night sky. The', 'sky. The moon rises', 'night sky. The', 'moon rises in', 'west. In the', 'out and', 'In the morning, the', 'out and shine', 'come out and shine', 'in the night sky.', 'in the', 'shine in the night', 'In the evening,', 'sky. The', 'and sets in', 'the east and', 'the night', 'In the evening, the', 'moon rises', 'morning, the', 'sets in', 'evening, the stars', 'the night sky.', 'The moon rises in', 'rises in the east', 'moon rises in the', 'sun rises in', 'and sets in the', 'out and shine in', 'stars come out and'}
assistant