1. Flatten 2D Array
flatten_1 = list(itertools.chain.from_iterable(ARR)) #방법 1
flatten_2 = list(itertools.chain(*ARR))
flatten_3 = sum(ARR,[])
flatten_4 = [elem for temp_arr in ARR for elem in temp_arr]FLAT = [j for temp in GRAPH for j in temp]
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