C is variable – if B is < 20″ (508mm), C is recommended to be between 3″ (76.2mm) and 4″ (101.6mm).
if B is > 20″ (508mm), C is recommended to be between 3″ (76.2mm) and 6.5″ (165.1mm)
If A < 8″, D will be 2″ (50.8mm)
If A > 8″, D will be 4″ (101.6mm)
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