Find duplicate values in a dictionary with array of values

Question

I have a dictionary like this

{1: array([1, 5, 7, 2, 8,  3,  4],
2: array([1, 10, 11, 12, 13, 8, 15])
3: array([10,20, 21, 22, 23, 24, 25])
4: array([7, 30, 3