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View Compilation Error

0_0_34865677_32506\Main.java:16: 错误: 已在方法 main(String[])中定义了变量 a
            char a=s.charAt(0);
                 ^
0_0_34865677_32506\Main.java:17: 错误: 已在方法 main(String[])中定义了变量 b
            char b=s.charAt(3);
                 ^
2 个错误


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