diff --git a/core/lib/Drupal/Core/Database/Query/Condition.php b/core/lib/Drupal/Core/Database/Query/Condition.php
index d32d00a23bb61219b0e14302eb1748793f1fe2c0..feb111b5c038179624f333b345247a1f4080bf97 100644
--- a/core/lib/Drupal/Core/Database/Query/Condition.php
+++ b/core/lib/Drupal/Core/Database/Query/Condition.php
@@ -58,7 +58,7 @@ public function __construct($conjunction) {
    * Implements Countable::count().
    *
    * Returns the size of this conditional. The size of the conditional is the
-   * size of its conditional array minus one, because one element is the the
+   * size of its conditional array minus one, because one element is the
    * conjunction.
    */
   public function count() {
diff --git a/core/lib/Drupal/Core/Datetime/DateHelper.php b/core/lib/Drupal/Core/Datetime/DateHelper.php
index 1357267f5805e5cc41a0d207f28282880f68e9a4..9cdd1f120eb84529d6c0706565f6e7cb24d5a006 100644
--- a/core/lib/Drupal/Core/Datetime/DateHelper.php
+++ b/core/lib/Drupal/Core/Datetime/DateHelper.php
@@ -3,7 +3,7 @@
  * @file
  * Contains \Drupal\Core\Datetime\DateHelper.
  *
- * Lots of helpful functions for use in massaging dates, specific to the the
+ * Lots of helpful functions for use in massaging dates, specific to the
  * Gregorian calendar system. The values include both translated and
  * untranslated values.
  *
diff --git a/core/lib/Drupal/Core/Entity/Query/ConditionInterface.php b/core/lib/Drupal/Core/Entity/Query/ConditionInterface.php
index 5c8bb6a9c29d054e9021b6105d8fe6ef1802bf25..056a795028207071c7fee7a0aa207bc0f0abf716 100644
--- a/core/lib/Drupal/Core/Entity/Query/ConditionInterface.php
+++ b/core/lib/Drupal/Core/Entity/Query/ConditionInterface.php
@@ -24,7 +24,7 @@ public function getConjunction();
    * Implements \Countable::count().
    *
    * Returns the size of this conditional. The size of the conditional is the
-   * size of its conditional array minus one, because one element is the the
+   * size of its conditional array minus one, because one element is the
    * conjunction.
    */
   public function count();
diff --git a/core/lib/Drupal/Core/Menu/MenuLinkTreeInterface.php b/core/lib/Drupal/Core/Menu/MenuLinkTreeInterface.php
index 517b4ba2cdbbaddcfc262eb23f72ccf7eb81949f..e41466611832766b4ec8ab30cf59570d6dd6ce21 100644
--- a/core/lib/Drupal/Core/Menu/MenuLinkTreeInterface.php
+++ b/core/lib/Drupal/Core/Menu/MenuLinkTreeInterface.php
@@ -110,7 +110,7 @@ public function maxDepth();
    * Finds the height of a subtree rooted by of the given ID.
    *
    * @param string $id
-   *   The the ID of an item in the storage.
+   *   The ID of an item in the storage.
    *
    * @return int
    *   Returns the height of the subtree. This will be at least 1 if the ID
diff --git a/core/modules/editor/editor.module b/core/modules/editor/editor.module
index 647b91fc08c71f6ccf3d67ca41a174e600b5ec26..b7ec8b5c62936c2670a9389fcb62a28750ff306e 100644
--- a/core/modules/editor/editor.module
+++ b/core/modules/editor/editor.module
@@ -203,7 +203,7 @@ function editor_form_filter_admin_format_validate($form, FormStateInterface $for
     return;
   }
 
-  // When using this form with JavaScript disabled in the browser, the the
+  // When using this form with JavaScript disabled in the browser, the
   // 'Configure' button won't be clicked automatically. So, when the user has
   // selected a text editor and has then clicked 'Save configuration', we should
   // point out that the user must still configure the text editor.
diff --git a/core/modules/system/core.api.php b/core/modules/system/core.api.php
index 090d9142a782cc05dc820766e1092fa045663aaf..17e9b280e7cd42348f7d56bf5b738ad417098568 100644
--- a/core/modules/system/core.api.php
+++ b/core/modules/system/core.api.php
@@ -1483,8 +1483,8 @@
  *
  * Alternatively, forms can be built directly via the routing system which will
  * take care of calling \Drupal::formBuilder()->getForm(). The following example
- * demonstrates the use of a routing.yml file to display a form at the the
- * given route.
+ * demonstrates the use of a routing.yml file to display a form at the given
+ * route.
  *
  * @code
  * example.form:
diff --git a/core/modules/system/src/Tests/Database/TransactionTest.php b/core/modules/system/src/Tests/Database/TransactionTest.php
index 00ec45832ce98103c7de705edf3c79d1e5a21fa4..6211ecb3ef82e41cb5a7d01cb3d38f692d2aa291 100644
--- a/core/modules/system/src/Tests/Database/TransactionTest.php
+++ b/core/modules/system/src/Tests/Database/TransactionTest.php
@@ -38,11 +38,10 @@ class TransactionTest extends DatabaseTestBase {
    * Encapsulates a transaction's "inner layer" with an "outer layer".
    *
    * This "outer layer" transaction starts and then encapsulates the "inner
-   * layer" transaction. This nesting is used to evaluate whether the the
-   * database transaction API properly supports nesting. By "properly supports,"
-   * we mean the outer transaction continues to exist regardless of what
-   * functions are called and whether those functions start their own
-   * transactions.
+   * layer" transaction. This nesting is used to evaluate whether the database
+   * transaction API properly supports nesting. By "properly supports," we mean
+   * the outer transaction continues to exist regardless of what functions are
+   * called and whether those functions start their own transactions.
    *
    * In contrast, a typical database would commit the outer transaction, start
    * a new transaction for the inner layer, commit the inner layer transaction,
diff --git a/sites/default/default.settings.php b/sites/default/default.settings.php
index d5d8704e03a5e04074a54f34e3f5b21d0f8ebac8..effa94df3e5091d2d07920a165478beec8c9b341 100644
--- a/sites/default/default.settings.php
+++ b/sites/default/default.settings.php
@@ -434,7 +434,7 @@
  * Private file path:
  *
  * A local file system path where private files will be stored. This directory
- * must be absolute, outside of the the Drupal installation directory and not
+ * must be absolute, outside of the Drupal installation directory and not
  * accessible over the web.
  *
  * Note: Caches need to be cleared when this value is changed to make the