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diff --git a/vendor/cebe/markdown/inline/StrikeoutTrait.php b/vendor/cebe/markdown/inline/StrikeoutTrait.php
new file mode 100644
index 000000000..6373e14e8
--- /dev/null
+++ b/vendor/cebe/markdown/inline/StrikeoutTrait.php
@@ -0,0 +1,37 @@
+<?php
+/**
+ * @copyright Copyright (c) 2014 Carsten Brandt
+ * @license https://github.com/cebe/markdown/blob/master/LICENSE
+ * @link https://github.com/cebe/markdown#readme
+ */
+
+namespace cebe\markdown\inline;
+
+/**
+ * Adds strikeout inline elements
+ */
+trait StrikeoutTrait
+{
+	/**
+	 * Parses the strikethrough feature.
+	 * @marker ~~
+	 */
+	protected function parseStrike($markdown)
+	{
+		if (preg_match('/^~~(.+?)~~/', $markdown, $matches)) {
+			return [
+				[
+					'strike',
+					$this->parseInline($matches[1])
+				],
+				strlen($matches[0])
+			];
+		}
+		return [['text', $markdown[0] . $markdown[1]], 2];
+	}
+
+	protected function renderStrike($block)
+	{
+		return '<del>' . $this->renderAbsy($block[1]) . '</del>';
+	}
+}