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Keywords: (3GdGSGWjQ GdaQYhfjIs; (3eUQ GdbOjeI s -- (3GdOhdI GdbOjeI (B( 3400 - 2260 (3b (B. (3e (B)s; (3eUQ GdbOjeIs -- (3GdOhdI GdhSWi (B( 2260 - 1580 (3b (B. (3e (B)s; (3eUQ GdbOjeIs -- (3GdOhdI GdMOjKI (B( 1580 - 525 (3b (B. (3e (B)s