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The safest way to modify the design includes reducing its size , since a smaller pen will be stronger , lighter , and easier to move than a larger one built in the same way . SS : I think certain things are simply easier to express in design than others . The structure of X3D makes it much easier to update on a regular basis . There are reasons why it is relatively easier to move at least two of those units forward - they are airborne units ; they are lighter ; their equipment sets are easier to recapitalize and they have been there .