Issue #26778: Fixed "a/an/and" typos in code comment and documentation.
diff --git a/Include/listobject.h b/Include/listobject.h
index daa513f..31843b5 100644
--- a/Include/listobject.h
+++ b/Include/listobject.h
@@ -2,7 +2,7 @@
/* List object interface */
/*
-Another generally useful object type is an list of object pointers.
+Another generally useful object type is a list of object pointers.
This is a mutable type: the list items can be changed, and items can be
added or removed. Out-of-range indices or non-list objects are ignored.