The yellow horizontal lines control the sizing of the letters, the vertical lines form boxes to control spacing, the blue bolded top and bottom horizontal lines give extra visual cuing for proper placement of letters on the line, and the shaded area allows enough spacing for the descension of letters (i.e., g, j, p, q, y).
Wide Rule Approximately .88" X .88" boxes, eleven boxes per line, five lines per page.
Narrow Rule Approximately .35" X.35" boxes, twenty boxes per line, thirteen lines per page. | 
Medium Rule twenty boxes per line, seven lines per page.
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