Issue #26778: Fixed "a/an/and" typos in code comment and documentation.
diff --git a/Lib/lib2to3/fixer_base.py b/Lib/lib2to3/fixer_base.py
index f6421ba..d437b96 100644
--- a/Lib/lib2to3/fixer_base.py
+++ b/Lib/lib2to3/fixer_base.py
@@ -50,7 +50,7 @@
         """Initializer.  Subclass may override.
 
         Args:
-            options: an dict containing the options passed to RefactoringTool
+            options: a dict containing the options passed to RefactoringTool
             that could be used to customize the fixer through the command line.
             log: a list to append warnings and other messages to.
         """