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imports in sage/combinat/

I was reading the code in sage/combinat/ and I noticed some weirdness in the imports. In the second line there is a

from sage.structure.element import Element, have_same_parent

and then in the fourth line there is

from sage.structure.element import have_same_parent

and later on we find

import sage.structure.element

Why is this so? Can't some of these lines be erased?