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Single and compound bearing faults: (a) outer race defect (ORD); (b) inner race defect (IRD); (c) roller defect (RD); (d) inner and outer race defect (IORD); (e) outer race and roller defect (ORRD); (f) inner race and roller (IRRD); (g) inner race, outer race, and roller (IORRD).
