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def is_palindrome(nums):
n = len(nums)
for i in range(n // 2):
if nums[i] != nums[n - 1 - i]:
return False
return True
def find_mirror_core(heartbeats):
n = len(heartbeats)
best = []
for start in range(n):
for end in range(start + 1, n + 1):
window = heartbeats[start:end]
if len(window) > len(best) and is_palindrome(window):
best = window
return best
print(find_mirror_core([1, 2, 3, 2, 1, 9, 9])) # Expected: [1, 2, 3, 2, 1]
print(find_mirror_core([5, 6, 7, 8])) # Expected: []
print(find_mirror_core([1, 2, 3, 2, 1, 1, 2, 3, 2, 1]))
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