src/main/java/org/apache/commons/net/nntp/NNTPReply.java [162:198]:
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    public static boolean isNegativePermanent(final int reply) {
        return reply >= 500 && reply < 600;
    }

    /**
     * Tests if a reply code is a negative transient response. All codes beginning with a 4 are negative transient responses. The NNTP server will send a
     * negative transient response on the failure of a correctly formatted command that could not be performed for some reason. For example, retrieving an
     * article that does not exist will result in a negative transient response.
     *
     * @param reply The reply code to test.
     * @return True if a reply code is a negative transient response, false if not.
     */
    public static boolean isNegativeTransient(final int reply) {
        return reply >= 400 && reply < 500;
    }

    /**
     * Tests if a reply code is a positive completion response. All codes beginning with a 2 are positive completion responses. The NNTP server will send a
     * positive completion response on the final successful completion of a command.
     *
     * @param reply The reply code to test.
     * @return True if a reply code is a positive completion response, false if not.
     */
    public static boolean isPositiveCompletion(final int reply) {
        return reply >= 200 && reply < 300;
    }

    /**
     * Tests if a reply code is a positive intermediate response. All codes beginning with a 3 are positive intermediate responses. The NNTP server will
     * send a positive intermediate response on the successful completion of one part of a multipart command or sequence of commands. For example, after a
     * successful POST command, a positive intermediate response will be sent to indicate that the server is ready to receive the article to be posted.
     *
     * @param reply The reply code to test.
     * @return True if a reply code is a positive intermediate response, false if not.
     */
    public static boolean isPositiveIntermediate(final int reply) {
        return reply >= 300 && reply < 400;
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src/main/java/org/apache/commons/net/smtp/SMTPReply.java [98:133]:
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    public static boolean isNegativePermanent(final int reply) {
        return reply >= 500 && reply < 600;
    }

    /**
     * Tests if a reply code is a negative transient response. All codes beginning with a 4 are negative transient responses. The SMTP server will send a
     * negative transient response on the failure of a command that can be reattempted with success.
     *
     * @param reply The reply code to test.
     * @return True if a reply code is a negative transient response, false if not.
     */
    public static boolean isNegativeTransient(final int reply) {
        return reply >= 400 && reply < 500;
    }

    /**
     * Tests if a reply code is a positive completion response. All codes beginning with a 2 are positive completion responses. The SMTP server will send a
     * positive completion response on the final successful completion of a command.
     *
     * @param reply The reply code to test.
     * @return True if a reply code is a positive completion response, false if not.
     */
    public static boolean isPositiveCompletion(final int reply) {
        return reply >= 200 && reply < 300;
    }

    /**
     * Tests if a reply code is a positive intermediate response. All codes beginning with a 3 are positive intermediate responses. The SMTP server will
     * send a positive intermediate response on the successful completion of one part of a multipart sequence of commands. For example, after a successful DATA
     * command, a positive intermediate response will be sent to indicate that the server is ready to receive the message data.
     *
     * @param reply The reply code to test.
     * @return True if a reply code is a positive intermediate response, false if not.
     */
    public static boolean isPositiveIntermediate(final int reply) {
        return reply >= 300 && reply < 400;
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