
    Design a function that determines the number of possible ways to organize content moderation rules into distinct filtering groups, where each rule must belong to exactly one group and no group can be empty. Given n content moderation categories (such as spam, harassment, or violence), calculate how many different ways these categories can be partitioned into sets for AI processing, where the order of rules within each group doesn't matter.
    

    
def bell_number(n):
    """
    Design a function that determines the number of possible ways to organize content moderation rules into distinct filtering groups, where each rule must belong to exactly one group and no group can be empty. Given n content moderation categories (such as spam, harassment, or violence), calculate how many different ways these categories can be partitioned into sets for AI processing, where the order of rules within each group doesn't matter.
    

    """
def bell_number(n):
    """
    Design a function that determines the number of possible ways to organize content moderation rules into distinct filtering groups, where each rule must belong to exactly one group and no group can be empty. Given n content moderation categories (such as spam, harassment, or violence), calculate how many different ways these categories can be partitioned into sets for AI processing, where the order of rules within each group doesn't matter.
    

    """
    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]