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Write a Python function `remove_duplicates` that takes a list of integers and returns a new list with all duplicate numbers removed. The function should preserve the order of the first occurrence of each number. #### Example Usage ```python [main.nopy] remove_duplicates([1, 2, 3, 2, 3, 4, 5]) # Output: [1, 2, 3, 4, 5] remove_duplicates([1, 2, 3, 4, 5]) # Output: [1, 2, 3, 4, 5] remove_duplicates([1, 1, 1, 1]) # Output: [1] ```
def remove_duplicates(nums):
"""
Remove duplicate numbers from the given list, preserving the order of first occurrences.
Args:
nums (list): A list of integers.
Returns:
list: A list with duplicates removed.
"""
# Placeholder for the solution
pass