
    Design a function that calculates the number of possible ways to organize content moderation rules into distinct policy groups, where each rule must belong to exactly one group and no groups can be empty. Given n different types of content violations (such as hate speech, harassment, and spam), determine how many different ways these rules can be grouped together to create comprehensive moderation policies.
    

    
def bell_number(n):
    """
    Design a function that calculates the number of possible ways to organize content moderation rules into distinct policy groups, where each rule must belong to exactly one group and no groups can be empty. Given n different types of content violations (such as hate speech, harassment, and spam), determine how many different ways these rules can be grouped together to create comprehensive moderation policies.
    

    """
def bell_number(n):
    """
    Design a function that calculates the number of possible ways to organize content moderation rules into distinct policy groups, where each rule must belong to exactly one group and no groups can be empty. Given n different types of content violations (such as hate speech, harassment, and spam), determine how many different ways these rules can be grouped together to create comprehensive moderation policies.
    

    """
    bell = [[0 for i in range(n + 1)] for j in range(n + 1)]
    bell[0][0] = 1
    for i in range(1, n + 1):
        bell[i][0] = bell[i - 1][i - 1]
        for j in range(1, i + 1):
            bell[i][j] = bell[i - 1][j - 1] + bell[i][j - 1]
    return bell[n][0]