-4d5(9-4d2)-7(9-4d2)
-(9-4d2)(4d5+7)
-(3-2d)(3+2d)(4d5+7)
(3+2d)(3+2d)(4d5+7)
4d5+7
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-4d5(9-4d2)-7(9-4d2)
-(9-4d2)(4d5+7)
-(3-2d)(3+2d)(4d5+7)
(3+2d)(3+2d)(4d5+7)
4d5+7