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l1 = [[1,2,3,4,4,4,4,'a', 'a', 'b'], [4,4,4,4,'a', 'a', 'b'], [1,2,3,4,'a', 'a', 'b']]
dict2 = {}


for elem in l1[1]:
    if elem in dict2:
        dict2[elem] += 1
    else:
        dict2[elem] = 1
        for elem in l1[2]:
            if elem in dict2:
                dict2[elem] += 2
            else:
                dict2[elem] = 2

print(dict2)

dict = {}

for n in l1:
    for z in n:
        if z in dict:
            dict[z] += 1
        else:
            dict[z] = 1
print(dict)

list_of_values = list(dict.keys())
print(list_of_values)