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def findPairs(lst, diff): st = set() for i in lst: if i - diff in st: print(i, i - diff) if i + diff in st: print(i + diff, i) st.add(i) lst = [4, 1, 7, 5, 8, 6, 9, 10] diff = 3 findPairs(lst, diff) ''' run: 4 1 7 4 8 5 9 6 10 7 '''