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Test the durability of the seat, back and armrests of the sofa, seat height, automatically test the back looseness, the remaining looseness of the back, the looseness of the armrest, and the remaining looseness of the armrest.
Test the durability of the seat, back and armrests of the sofa, seat height, automatically test the back looseness, the remaining looseness of the back, the looseness of the armrest, and the remaining looseness of the armrest.
