remove lines between use statements

                    
|Q            |A   |
|---          |--- |
|Bug Fix?     |#575|
|New Feature? |n   |
|BC Breaks?   |n   |
|Deprecations?|n   |
|Tests Pass?  |n   |
|Fixed Tickets|    |
|License      |MIT |
|Doc PR       |    |
                    


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I won't think this will change algorithm a lot.
OK, we can do it at finishing, but just need to remember to do it.