human
Write a function to find frequency of each element in a flattened list of lists, returned in a dictionary. Here is a solution in Python:
assistant
#Here is Python program to find frequency of each element in a flattened list of lists, returned in a dictionary.
 def frequency_lists(list1):
    list1 = [item for sublist in list1 for item in sublist]
    dic_data = {}
    for num in list1:
        if num in dic_data.keys():
            dic_data[num] += 1
        else:
            key = num
            value = 1
            dic_data[key] = value
    return dic_data