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diff --git a/advancedcontentfilter/vendor/symfony/cache-contracts/CallbackInterface.php b/advancedcontentfilter/vendor/symfony/cache-contracts/CallbackInterface.php
new file mode 100644
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+++ b/advancedcontentfilter/vendor/symfony/cache-contracts/CallbackInterface.php
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+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Contracts\Cache;
+
+use Psr\Cache\CacheItemInterface;
+
+/**
+ * Computes and returns the cached value of an item.
+ *
+ * @author Nicolas Grekas <p@tchwork.com>
+ */
+interface CallbackInterface
+{
+    /**
+     * @param CacheItemInterface|ItemInterface $item  The item to compute the value for
+     * @param bool                             &$save Should be set to false when the value should not be saved in the pool
+     *
+     * @return mixed The computed value for the passed item
+     */
+    public function __invoke(CacheItemInterface $item, bool &$save);
+}