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Keywords: Backache -- Prevention; Backache -- Treatment; (3GdJeQjfGJ GdQjGVjIs; (3GdXgQs -- (3BdGes; (3GdXgQs -- (3YdGL WHjYjs; (3GdXgQs -- (3YdGLs; (3GddjGbI GdHOfjIs