Find the second largest number in a list of integers. If there is no second largest number (all numbers are the same or only one unique number exists), return null.
Examples:
Input: numbers = [5, 2, 8, 1, 9]
Output: 8
Explanation: 9 is largest, 8 is second largest
Input: numbers = [3, 3, 3]
Output: null
Explanation: All numbers are the same, no second largest exists
Input: numbers = [10]
Output: null
Explanation: Only one number exists, cannot find second largest
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