src/main/java/org/apache/commons/net/ftp/FTPClient.java [2030:2039]:
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        if (socket == null) {
            return engine;
        }
        try {
            engine.readServerList(socket.getInputStream(), getControlEncoding());
        } finally {
            IOUtils.closeQuietly(socket);
        }
        completePendingCommand();
        return engine;
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src/main/java/org/apache/commons/net/ftp/FTPClient.java [2146:2155]:
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        if (socket == null) {
            return engine;
        }
        try {
            engine.readServerList(socket.getInputStream(), getControlEncoding());
        } finally {
            IOUtils.closeQuietly(socket);
            completePendingCommand();
        }
        return engine;
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