The evenly-spaced broken lines in the Figures illustrate portions of the mill that form no part of the claimed design. The dash-dot broken lines in the Figures between the solid line portions and the evenly-spaced broken line portions illustrate the boundaries of the claimed design and form no part of the claimed design. The break lines that separate the mill in the Figures represent that the mill has indeterminate width and length. The break lines and any portion between the break lines form no part of the claimed design.