Что выведет код?

with open("data.txt", "w", encoding="utf-8") as f:
    f.write("apple\n")
    f.write("banana\n")
    f.write("cherry\n")

def read_lines():
    for line in open("data.txt"):
        yield line.strip()

lines = read_lines()
print(next(lines))
print(next(lines))
print(next(lines))