I write function called has_duplicates that takes a list and returns True if there is any element that appears more than once. It should not modify the original list. 

For example:
>>> t1 = [5, 1, 2, 3, 4]
>>> has_duplicates(t1)
False
>>> t2 = [5, 1, 2, 3, 2, 8, 10]
>>> has_duplicates(t2)
True