<s>[INST] def calculate_station_differences(stations):
    """
    This function calculates the difference in annual rainfall between each pair of weather stations.
    
    Args:
    stations (dict): A dictionary where the keys are the names of weather stations and the values are lists of annual rainfall data.
    
    Returns:
    list: A list of tuples, where each tuple contains the names of two stations and the absolute difference in their annual rainfall.
    """[/INST]