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vendor/phpoffice/math/docs/usage/elements/row.md

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+## Usage
+
+To create a row, use the `PhpOffice\Math\Element\Row` class.
+
+### Methods
+#### add
+
+The method add an element to the row.
+The method has one parameter : 
+
+* `PhpOffice\Math\Element\AbstractElement` **$element**
+
+#### getElements
+
+The method return all elements of the row.
+
+#### remove
+
+The method remove an element to the row.
+The method has one parameter : 
+
+* `PhpOffice\Math\Element\AbstractElement` **$element**
+
+## Example
+
+### Math
+<math display="block">
+  <mrow>
+    <mn>1</mn>
+    <mo>+</mo>
+    <mi>K</mi>
+  </mrow>
+</math>
+
+### XML
+``` xml
+<math display="block">
+  <mrow>
+    <mn>1</mn>
+    <mo>+</mo>
+    <mi>K</mi>
+  </mrow>
+</math>
+```
+
+### PHP
+
+``` php
+<?php
+
+use PhpOffice\Math\Element;
+use PhpOffice\Math\Math;
+
+$math = new Math();
+
+$row = new Element\Row();
+$row->add(new Element\Numeric(1));
+$row->add(new Element\Operator('+'));
+$row->add(new Element\Identifier('K'));
+
+$math->add($row);
+```