Question: public class Parentheses { private static final char L_PAREN = '('; private static final char R_PAREN = ')'; private static final char L_BRACE = '{';

$public class Parentheses { private static final char L_PAREN = '(';$

public class Parentheses { private static final char L_PAREN = '('; private static final char R_PAREN = ')'; private static final char L_BRACE = '{'; private static final char R_BRACE = '}'; private static final char L_BRACKET = ''; private static final char R_BRACKET = '1'; == public static boolean foo(String s) { Stack stack = new Stack(); for (int i = 0; i

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