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title: DataWeave System Properties
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---
product: DataWeave
version: 2.6
---

# DataWeave System Properties

> For the full documentation index, see: https://docs.mulesoft.com/llms.txt

DataWeave supports several system properties. To use these properties in application development and
deployments, see [System Properties](https://docs.mulesoft.com/mule-runtime/latest/mule-app-properties-system).

<table><colgroup><col> <col></colgroup><thead><tr><th>Property</th><th>Description</th></tr></thead><tbody><tr><td><p><code>com.mulesoft.dw.buffered_char_sequence.enabled</code></p></td><td><div><div><p>Controls whether an internal <code>BufferedCharSequence</code> improvement is enabled or disabled. When this property is set to <code>true</code>, DataWeave does not load large fields (greater than 1.5M) into memory. DataWeave reads these fields by chunk. This feature reduces performance to prevent an out-of-memory error.</p></div><div><ul><li><p>Type: <code>Boolean</code></p></li><li><p>Default: <code>true</code></p></li></ul></div></div></td></tr><tr><td><p><code>com.mulesoft.dw.buffersize</code></p></td><td><div><div><p>Sets the size (in bytes) of in-memory input and output buffers that DataWeave uses to retain processed inputs and outputs. DataWeave stores payloads that exceed this size in temporary files <code>dw-buffer-index-${count}.tmp</code> and <code>dw-buffer-output-${count}.tmp</code>. See <a href="https://docs.mulesoft.com/dataweave/2.6/dataweave-memory-management">DataWeave Memory Management</a>.</p></div><div><ul><li><p>Type: <code>Number</code></p></li><li><p>Default: <code>8192</code></p></li></ul></div></div></td></tr><tr><td><p><code>com.mulesoft.dw.charbuffersize</code></p></td><td><div><div><p>Determines the size (in bytes) of the buffer used by the writer.</p></div><div><ul><li><p>Type: <code>Number</code></p></li><li><p>Default: <code>4096</code></p></li></ul></div></div></td></tr><tr><td><p><code>com.mulesoft.dw.coercionexception.verbose</code></p></td><td><div><div><p>By default, adds to coercion exceptions more information about data that fails to coerce. When this property is set to <code>false</code>, DataWeave does not display the additional metadata.</p></div><div><ul><li><p>Type: <code>Boolean</code></p></li><li><p>Default: <code>true</code></p></li></ul></div></div></td></tr><tr><td><p><code>com.mulesoft.dw.cpulimit.watchdog</code></p></td><td><div><div><p>Monitors and limits script execution time when set to <code>true</code>.</p></div><div><ul><li><p>Type: <code>Boolean</code></p></li><li><p>Default: <code>true</code></p></li></ul></div></div></td></tr><tr><td><p><code>com.mulesoft.dw.date_minus_back_compatibility</code></p></td><td><div><div><p>Restores the <a href="https://docs.mulesoft.com/dataweave/2.6/dataweave-cookbook-add-and-subtract-time">Add and Subtract Time</a> behaviors that changed in 2.3.0 when this property is set to <code>true</code>.</p></div><div><p>For example, consider the following DataWeave script:</p></div><div><div><pre><code data-lang="dataweave">%dw 2.0
output application/dw
---
|2019-10-01| - |2018-09-23|</code></pre></div></div><div><ul><li><p>In DataWeave 2.3.0, the expression returns <code>PT8952H</code>.</p></li><li><p>In DataWeave 2.2.0, the expression returns <code>P1Y8D</code>.</p></li><li><p>Type: <code>Boolean</code></p></li><li><p>Default: <code>false</code></p></li></ul></div><div><p>Available for language levels: 2.3, 2.4, 2.5</p></div></div></td></tr><tr><td><p><code>com.mulesoft.dw.decode_binaries_with_writer_encoding</code></p></td><td><div><div><p>When set to <code>true</code>, binary values in JSON are written using JsonWriter encoding. Otherwise, the property uses either the encoding defined in the value schema or the default one.</p></div><div><ul><li><p>Type: <code>Boolean</code></p></li><li><p>Default: <code>false</code></p></li></ul></div></div></td></tr><tr><td><p><code>com.mulesoft.dw.defaultOperator.disableExceptionHandling</code></p></td><td><div><div><p>When set to <code>true</code>, DataWeave disables the <code>default</code> operator that catches runtime exceptions. Enabling the <code>default</code> operator doesn’t return the <code>default value</code> when a runtime exception occurs. When set to <code>false</code>, the <code>default</code> operator catches the runtime exceptions and returns the <code>default value</code>.</p></div><div><ul><li><p>Type: <code>Boolean</code></p></li><li><p>Default: <code>true</code></p></li></ul></div><div><p>Available for language levels: 2.5, 2.6, 2.7, 2.8, 2.9</p></div></div></td></tr><tr><td><p><code>com.mulesoft.dw.directbuffer.disable</code></p></td><td><div><div><p>Controls whether DataWeave uses off-heap memory (the default) or heap memory. DataWeave uses off-heap memory for internal buffering, which can cause issues on systems that have only a small amount of memory. See <a href="https://docs.mulesoft.com/dataweave/2.6/dataweave-memory-management">DataWeave Memory Management</a>.</p></div><div><ul><li><p>Type: <code>Boolean</code></p></li><li><p>Default: <code>false</code></p></li></ul></div></div></td></tr><tr><td><p><code>com.mulesoft.dw.dump_files</code></p></td><td><div><div><p><em>Experimental:</em> Dumps the input context and the failing script into a folder when this property is set to <code>true</code>. This behavior enables you to track the failing script and the data that makes the script fail, which is particularly useful for verifying that the received input data is valid. Incorrect scripts often fail when an upstream component generates invalid data.</p></div><div><ul><li><p>Type: <code>Boolean</code></p></li><li><p>Default: <code>false</code> <code>com.mulesoft.dw.dump_files</code> is an <em>experimental feature</em> that is subject to change or removal from future versions of DataWeave. See <a href="https://docs.mulesoft.com/dataweave/2.6/dataweave-troubleshoot">Troubleshooting a Failing DataWeave Script</a>.</p></li></ul></div></div></td></tr><tr><td><p><code>com.mulesoft.dw.dump_folder</code></p></td><td><div><div><p><em>Experimental:</em> Specifies the path in which to dump files when <code>com.mulesoft.dw.dump_files</code> is set to <code>true</code>.</p></div><div><ul><li><p>Type: <code>String</code></p></li><li><p>Default: <code>java.io.tempdir (system property value)</code> <code>com.mulesoft.dw.dump_folder</code> is an <em>experimental feature</em> that is subject to change or removal from future versions of DataWeave. See <a href="https://docs.mulesoft.com/dataweave/2.6/dataweave-troubleshoot">Troubleshooting a Failing DataWeave Script</a>.</p></li></ul></div></div></td></tr><tr><td><p><code>com.mulesoft.dw.dumper_fill_stacktrace</code></p></td><td><div><div><p><em>Experimental:</em> Adds the StackTrace for dumper exceptions when <code>com.mulesoft.dw.dump_files</code> is set to <code>true</code>.</p></div><div><ul><li><p>Type: <code>Boolean</code></p></li><li><p>Default: <code>false</code> <code>com.mulesoft.dw.dumper_fill_stacktrace</code> is an <em>experimental feature</em> that is subject to change or removal from future versions of DataWeave. See <a href="https://docs.mulesoft.com/dataweave/2.6/dataweave-troubleshoot">Troubleshooting a Failing DataWeave Script</a>.</p></li></ul></div></div></td></tr><tr><td><p><code>com.mulesoft.dw.error_value_length</code></p></td><td><div><div><p>Sets the maximum length of exception messages to display to the user. The message is truncated to the maximum length. This setting is useful for avoiding long exception messages.</p></div><div><ul><li><p>Type: <code>Number</code></p></li><li><p>Default: <code>80</code></p></li></ul></div></div></td></tr><tr><td><p><code>com.mulesoft.dw.indexsize</code></p></td><td><div><div><p>Sets the maximum size (in bytes) of the page in memory that indexed readers use.</p></div><div><ul><li><p>Type: <code>Number</code></p></li><li><p>Default: <code>1572864</code></p></li></ul></div></div></td></tr><tr><td><p><code>com.mulesoft.dw.java.disable_set_accessible</code></p></td><td><div><div><p>When set to <code>true</code>, the JavaModuleLoader doesn’t change the accessible flag for fields or methods used via reflection. The default value evaluates the current JDK version used and the language level. The value is <code>true</code> when the used JDK is 17 or later and the language version is 2.6 or later.</p></div><div><ul><li><p>Type: <code>Boolean</code></p></li><li><p>Default:</p><div><ul><li><p><code>false</code> for language levels: 2.5</p></li><li><p><code>true</code> for language levels: 2.6, 2.7, 2.8, 2.9</p></li></ul></div></li></ul></div><div><p>Available for language levels: 2.5, 2.6, 2.7, 2.8, 2.9</p></div></div></td></tr><tr><td><p><code>com.mulesoft.dw.java.enabled_class_definition_lookup</code></p></td><td><div><div><p>When set to <code>true</code>, the JavaModuleLoader honors the public interface definition of the given bean instance to access properties via reflection. The default value evaluates the current JDK version used and the language level. The value is <code>true</code> when the used JDK is 17 or later and the language version is 2.10 or later. If set to <code>false</code>, the JavaModuleLoader uses the specific bean’s class definition to access properties via reflection, which can cause accessibility issues.</p></div><div><ul><li><p>Type: <code>Boolean</code></p></li><li><p>Default:</p><div><ul><li><p><code>false</code> for language levels: 2.5, 2.6</p></li></ul></div></li></ul></div><div><p>Available for language levels: 2.5, 2.6</p></div></div></td></tr><tr><td><p><code>com.mulesoft.dw.java.stacktrace</code></p></td><td><div><div><p>Specifies the depth of the Java stack trace.</p></div><div><ul><li><p>Type: <code>Number</code></p></li><li><p>Default: <code>6</code></p></li></ul></div></div></td></tr><tr><td><p><code>com.mulesoft.dw.javaSqlDateToDate</code></p></td><td><div><div><p>When set, <code>java.sql.Date</code> maps to the DataWeave <code>Date</code> type. If <code>false</code>, it maps to <code>DateTime</code>.</p></div><div><ul><li><p>Type: <code>Boolean</code></p></li><li><p>Default:</p><div><ul><li><p><code>false</code> for language levels: 2.4</p></li><li><p><code>true</code> for language levels: 2.5</p></li></ul></div></li></ul></div><div><p>Available for language levels: 2.4, 2.5</p></div></div></td></tr><tr><td><p><code>com.mulesoft.dw.legacySizeOfNumber</code></p></td><td><div><div><p>When set to <code>true</code>, DataWeave returns <code>1</code> when calling <code>sizeOf()</code> function for any <code>Number</code> value.</p></div><div><ul><li><p>Type: <code>Boolean</code></p></li><li><p>Default:</p><div><ul><li><p><code>false</code> for language levels: 2.6, 2.7, 2.8, 2.9 Available for language levels: 2.6, 2.7, 2.8, 2.9</p></li></ul></div></li></ul></div></div></td></tr><tr><td><p><code>com.mulesoft.dw.max_memory_allocation</code></p></td><td><div><div><p>Sets the size (in bytes) of each slot in the off-heap memory pool. DataWeave stores payloads that exceed this size in temporary files <code>dw-buffer-input-${count}.tmp</code> and <code>dw-buffer-output-${count}.tmp</code>.</p></div><div><ul><li><p>Type: <code>Number</code></p></li><li><p>Default: <code>1572864</code></p></li></ul></div></div></td></tr><tr><td><p><code>com.mulesoft.dw.memory_pool_size</code></p></td><td><div><div><p>Sets the number of slots in the memory pool. DataWeave buffers use off-heap memory from a pool, up to a defined size (<code>com.mulesoft.dw.memory_pool_size</code> * <code>com.mulesoft.dw.max_memory_allocation</code>). DataWeave allocates the remainder using heap memory. See <a href="https://docs.mulesoft.com/dataweave/2.6/dataweave-memory-management">DataWeave Memory Management</a>.</p></div><div><ul><li><p>Type: <code>Number</code></p></li><li><p>Default: <code>60</code></p></li></ul></div></div></td></tr><tr><td><p><code>com.mulesoft.dw.multipart.defaultContentType</code></p></td><td><div><div><p>Sets the default Content-Type to use on parts of the <code>multipart/*</code> format when a <code>Content-Type</code> is not specified. See also, the multipart reader property <a href="https://docs.mulesoft.com/dataweave/2.6/dataweave-formats-multipart#properties">defaultContentType</a>. <em>Introduced in DataWeave 2.3 (2.3.0-20210720) for the August 2021 release of Mule 4.3.0-20210719.</em></p></div><div><ul><li><p>Type: <code>String</code></p></li><li><p>Default: <code>application/octet-stream</code></p></li></ul></div></div></td></tr><tr><td><p><code>com.mulesoft.dw.scheduler.size</code></p></td><td><div><div><p>Specifies the size of DataWeave scheduler thread pool.</p></div><div><ul><li><p>Type: <code>Number</code></p></li><li><p>Default: <code>100</code></p></li></ul></div></div></td></tr><tr><td><p><code>com.mulesoft.dw.stacksize</code></p></td><td><div><div><p>Sets the maximum size of the stack. When a function recurses too deeply, DataWeave throws an error, such as Stack Overflow. The maximum size limit is 256.</p></div><div><ul><li><p>Type: <code>Number</code></p></li><li><p>Default: <code>256</code></p></li></ul></div></div></td></tr><tr><td><p><code>com.mulesoft.dw.stripTrailingZeroes</code></p></td><td><div><div><p>When set to <code>false</code>, DataWeave restores the behavior of preserving trailing zeroes for some formats (such as DataWeave, JSON, and YAML) present in 2.4.0. Starting with 2.5.0, trailing zeroes are removed by default. .DataWeave script:</p></div><div><div><pre><code data-lang="xml">%dw 2.4
output application/json
---
1.00</code></pre></div></div><div><ul><li><p>If <code>com.mulesoft.dw.stripTrailingZeroes</code> is set to <code>false</code>, the script returns the following output: <code>1.00</code></p></li><li><p>If <code>com.mulesoft.dw.stripTrailingZeroes</code> is set to <code>true</code>, the script returns the following output: <code>1</code></p></li><li><p>Type: <code>Boolean</code></p></li><li><p>Default:</p><div><ul><li><p><code>false</code> for language levels:</p></li><li><p><code>true</code> for language levels: 2.5, 2.6, 2.7, 2.8, 2.9</p></li></ul></div></li></ul></div><div><p>Available for language levels: 2.5, 2.6, 2.7, 2.8, 2.9</p></div></div></td></tr><tr><td><p><code>com.mulesoft.dw.telemetry.bufferSize</code></p></td><td><div><div><p>Determines the size in bytes of the telemetry event buffer.</p></div><div><ul><li><p>Type: <code>Number</code></p></li><li><p>Default: <code>1048576</code></p></li></ul></div></div></td></tr><tr><td><p><code>com.mulesoft.dw.telemetry.enabled</code></p></td><td><div><div><p>Enables Dataweave telemetry service.</p></div><div><ul><li><p>Type: <code>Boolean</code></p></li><li><p>Default: <code>false</code></p></li></ul></div></div></td></tr><tr><td><p><code>com.mulesoft.dw.telemetry.memory</code></p></td><td><div><div><p>When set to <code>true</code>, the telemetry service collects memory usage statistics.</p></div><div><ul><li><p>Type: <code>Boolean</code></p></li><li><p>Default: <code>false</code></p></li></ul></div></div></td></tr><tr><td><p><code>com.mulesoft.dw.telemetry.sync</code></p></td><td><div><div><p>When set to <code>true</code>, telemetry events are published synchronously.</p></div><div><ul><li><p>Type: <code>Boolean</code></p></li><li><p>Default: <code>false</code></p></li></ul></div></div></td></tr><tr><td><p><code>com.mulesoft.dw.track.cursor.close</code></p></td><td><div><div><p>When set to <code>true</code>, tracks the stack trace from which the {CursorProvider#close()} method is called. Use this property for troubleshooting, for example, if {CursorProvider#openCursor()} is called on a cursor that is already closed.</p></div><div><ul><li><p>Type: <code>Boolean</code></p></li><li><p>Default: <code>false</code></p></li></ul></div></div></td></tr><tr><td><p><code>com.mulesoft.dw.valueSelector.selectsAlwaysFirst</code></p></td><td><div><div><p>When set to <code>true</code>, returns the first occurrence of an element (even if the element appears more than once). Enabling this behavior degrades performance.</p></div><div><p>The following example illustrates the behavior that is controlled by this property. (Assume that the DataWeave script acts on the XML input.)</p></div><div><div>XML input:</div><div><pre><code data-lang="xml">&lt;root&gt;
  &lt;users&gt;
     &lt;user&gt;
       &lt;lname&gt;chibana&lt;/lname&gt;
       &lt;name&gt;Shoki&lt;/name&gt;
     &lt;/user&gt;
     &lt;user&gt;
       &lt;name&gt;Shoki&lt;/name&gt;
       &lt;name&gt;Tomo&lt;/name&gt;
     &lt;/user&gt;
  &lt;/users&gt;
&lt;/root&gt;</code></pre></div></div><div><div>DataWeave script:</div><div><pre><code data-lang="xml">%dw 2.0
output application/json
---
{
    shokis: payload.root.users.*user map $.name
}</code></pre></div></div><div><ul><li><p>If <code>com.mulesoft.dw.valueSelector.selectsAlwaysFirst</code> is set to <code>true</code>, the script returns the following output:</p><div><div><pre><code data-lang="json">{
  "shokis": [
    "Shoki",
    "Shoki"
  ]
}</code></pre></div></div></li><li><p>If <code>com.mulesoft.dw.valueSelector.selectsAlwaysFirst</code> is set to <code>false</code>, the script returns the following output:</p><div><div><pre><code data-lang="json">{
  "shokis": [
    "Shoki",
    "Tomo"
  ]
}</code></pre></div></div></li><li><p>Type: <code>Boolean</code></p></li><li><p>Default: <code>false</code></p></li></ul></div><div><p>Available for language levels: 2.3, 2.4, 2.5</p></div></div></td></tr><tr><td><p><code>com.mulesoft.dw.workingdirectory.base</code></p></td><td><div><div><p>Specifies the base directory in which temporary files are written.</p></div><div><ul><li><p>Type: <code>String</code></p></li><li><p>Default: <code>java.io.tmpdir (system property value)</code></p></li></ul></div></div></td></tr><tr><td><p><code>com.mulesoft.dw.workingdirectory.delete_sync</code></p></td><td><div><div><p>File deletion occurs synchronously when this property is set to <code>true</code>.</p></div><div><ul><li><p>Type: <code>Boolean</code></p></li><li><p>Default: <code>false</code></p></li></ul></div></div></td></tr><tr><td><p><code>com.mulesoft.dw.workingdirectory.max_output_buffer_size</code></p></td><td><div><div><p>Specifies the maximum size of a file written in bytes.</p></div><div><ul><li><p>Type: <code>Long</code></p></li><li><p>Default: <code>-1</code></p></li></ul></div></div></td></tr><tr><td><p><code>com.mulesoft.dw.workingdirectory.tracking</code></p></td><td><div><div><p>Each script generates temporary files in their own directory when this property is set to <code>true</code>.</p></div><div><ul><li><p>Type: <code>Boolean</code></p></li><li><p>Default: <code>false</code></p></li></ul></div></div></td></tr><tr><td><p><code>com.mulesoft.dw.xml.supportDTD</code></p></td><td><div><div><p>Controls whether DTD handling is enabled or disabled. When this property is set to <code>false</code>, DataWeave skips processing of both internal and external subsets.</p></div><div><ul><li><p>Type: <code>Boolean</code></p></li><li><p>Default: <code>false</code></p></li></ul></div></div></td></tr><tr><td><p><code>com.mulesoft.dw.xml_reader.honourMixedContentStructure</code></p></td><td><div><div><p>When set to <code>true</code>, DataWeave retains a mixed-content structure instead of grouping text with mixed content into a single text field.</p></div><div><ul><li><p>Type: <code>Boolean</code></p></li><li><p>Default:</p><div><ul><li><p><code>false</code> for language levels: 2.4</p></li><li><p><code>true</code> for language levels: 2.5</p></li></ul></div></li></ul></div><div><p>Available for language levels: 2.4, 2.5</p></div></div></td></tr><tr><td><p><code>com.mulesoft.dw.xml_reader.honourXmlDeclarationEncoding</code></p></td><td><div><div><p>When this property is set to <code>true</code>, DataWeave uses the encoding declared in the XML if present.</p></div><div><ul><li><p>Type: <code>Boolean</code></p></li><li><p>Default:</p><div><ul><li><p><code>false</code> for language levels: 2.4, 2.5</p></li><li><p><code>true</code> for language levels: 2.6, 2.7, 2.8, 2.9 Available for language levels: 2.4, 2.5, 2.6, 2.7, 2.8, 2.9</p></li></ul></div></li></ul></div></div></td></tr><tr><td><p><code>com.mulesoft.dw.xml_writer.declareXmlNamespace</code></p></td><td><div><div><p>When set to <code>false</code>, DataWeave doesn’t declare the <code>xml</code> implicit namespace.</p></div><div><ul><li><p>Type: <code>Boolean</code></p></li><li><p>Default:</p><div><ul><li><p><code>true</code> for language levels: 2.4, 2.5</p></li><li><p><code>false</code> for language levels: 2.6</p></li></ul></div></li></ul></div><div><p>Available for language levels: 2.4, 2.5, 2.6</p></div></div></td></tr><tr><td><p><code>mule.dw.java_module_loader_deterministic_functions_ordering</code></p></td><td><div><div><p>When set to <code>true</code>, the JavaModuleLoader loads the methods for Java Classes in deterministic order. DataWeave considers the method name, the parameters count, and finally, the parameter type name.</p></div><div><ul><li><p>Type: <code>Boolean</code></p></li><li><p>Default: <code>true</code> for language levels: 2.5, 2.6</p></li></ul></div><div><p>Available for language levels: 2.5, 2.6</p></div></div></td></tr><tr><td><p><code>mule.dw.remove_shadowed_implicit_inputs</code></p></td><td><div><div><p>If a variable with the same name is declared at the root level and this property is set to <code>true</code>, DataWeave removes implicit inputs.</p></div><div><ul><li><p>Type: <code>Boolean</code></p></li><li><p>Default: <code>true</code></p></li></ul></div></div></td></tr><tr><td><p><code>com.mulesoft.dw.csv_reader.indexed.retainStringValueInMemory</code></p></td><td><div><div><p>When set to <code>false</code>, this property prevents DataWeave indexed readers for CSV from keeping string value references in memory. While this can reduce performance, it helps prevent out-of-memory errors.</p></div><div><ul><li><p>Type: <code>Boolean</code></p></li><li><p>Default:</p><div><ul><li><p><code>true</code> for language levels: 2.6, 2.7, 2.8, 2.9 Available for language levels: 2.6, 2.7, 2.8, 2.9</p></li></ul></div></li></ul></div></div></td></tr><tr><td><p><code>com.mulesoft.dw.csv_writer.alwaysEscapeQuotesInCSV</code></p></td><td><div><div><p>When set to <code>true</code>, DataWeave escapes quotes in CSV.</p></div><div><ul><li><p>Type: <code>Boolean</code></p></li><li><p>Default:</p><div><ul><li><p><code>false</code> for language levels: 2.4</p></li><li><p><code>true</code> for language levels: 2.5 Available for language levels: 2.4, 2.5</p></li></ul></div></li></ul></div></div></td></tr><tr><td><p><code>com.mulesoft.dw.surrogateCharCodeSupport</code></p></td><td><div><div><p>When set to <code>true</code>, the <code>fromCharCode</code> function supports surrogate characters and throws an exception if the code point isn’t a valid Unicode character.</p></div><div><ul><li><p>Type: <code>Boolean</code></p></li><li><p>Default:</p><div><ul><li><p><code>false</code> for language levels: 2.6, 2.7, 2.8, 2.9 Available for language levels: 2.6, 2.7, 2.8, 2.9</p></li></ul></div></li></ul></div></div></td></tr><tr><td><p><code>com.mulesoft.dw.xml_reader.allowIndexedLatin1</code></p></td><td><div><div><p>When set to <code>true</code>, DataWeave lets you use the indexed reader for Latin1(ISO-8859-1) encoding. Use this for backward compatibility only, as Latin1 isn’t fully supported.</p></div><div><ul><li><p>Type: <code>Boolean</code></p></li><li><p>Default:</p><div><ul><li><p><code>true</code> for language levels: 2.6, 2.7, 2.8, 2.9 Available for language levels: 2.6, 2.7, 2.8, 2.9</p></li></ul></div></li></ul></div></div></td></tr></tbody></table>