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namespace? expression.range; // range [1]; [[1]]; [2, 1 + 1]; [1:1]; [2:2, 1 + 1: 1 + 1]; [1:2:3, [1,2,3]]; [::-1]; [:-2:]; [2::]; [1 + 1]; [1 + 1] + 1; [1,2,3]; [[1,2,3]]; [1:2:3,[1,2,3]];