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python - Create list can only concatenate str (not "int") to str

I would to like to create a list programmatically based on following variables:

a = 'a'

b = 'b'

c = 1

d = 2

ab =  a + b + c + c

ac = list(ab)

But I am getting following message:

TypeError: can only concatenate str (not "int") to str

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by (71.8m points)

Replace

ab =  a + b + c + c

with

ab = [a, b, c, c]

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