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"Rigid support sway bracing must be provided at changes in direction greater than 45 degrees (0.79 rad) for _________________________________. A. pipe sizes 2 inches (51 mm) and larger. B. pipe sizes 3 inches (77 mm) and larger. C. pipe sizes 4 inches (102 mm) and larger. D. pipe sizes 6 inches (153 mm) and larger. E. all pipes!"

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