
    Design a function that determines the number of different ways to organize content moderation rules into independent processing groups, where each rule must belong to exactly one group and no group can be empty. Given n moderation rules, calculate how many distinct arrangements of these rules into groups are possible to optimize the parallel processing of content analysis.
    

    
def bell_number(n):
    """
    Design a function that determines the number of different ways to organize content moderation rules into independent processing groups, where each rule must belong to exactly one group and no group can be empty. Given n moderation rules, calculate how many distinct arrangements of these rules into groups are possible to optimize the parallel processing of content analysis.
    

    """
def bell_number(n):
    """
    Design a function that determines the number of different ways to organize content moderation rules into independent processing groups, where each rule must belong to exactly one group and no group can be empty. Given n moderation rules, calculate how many distinct arrangements of these rules into groups are possible to optimize the parallel processing of content analysis.
    

    """
    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]