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diff --git a/lib/sqlalchemy/ext/declarative/__init__.py b/lib/sqlalchemy/ext/declarative/__init__.py
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+++ b/lib/sqlalchemy/ext/declarative/__init__.py
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+# ext/declarative/__init__.py
+# Copyright (C) 2005-2022 the SQLAlchemy authors and contributors
+# <see AUTHORS file>
+#
+# This module is part of SQLAlchemy and is released under
+# the MIT License: https://www.opensource.org/licenses/mit-license.php
+
+from .extensions import AbstractConcreteBase
+from .extensions import ConcreteBase
+from .extensions import DeferredReflection
+from .extensions import instrument_declarative
+from ... import util
+from ...orm.decl_api import as_declarative as _as_declarative
+from ...orm.decl_api import declarative_base as _declarative_base
+from ...orm.decl_api import DeclarativeMeta
+from ...orm.decl_api import declared_attr
+from ...orm.decl_api import has_inherited_table as _has_inherited_table
+from ...orm.decl_api import synonym_for as _synonym_for
+
+
+@util.moved_20(
+    "The ``declarative_base()`` function is now available as "
+    ":func:`sqlalchemy.orm.declarative_base`."
+)
+def declarative_base(*arg, **kw):
+    return _declarative_base(*arg, **kw)
+
+
+@util.moved_20(
+    "The ``as_declarative()`` function is now available as "
+    ":func:`sqlalchemy.orm.as_declarative`"
+)
+def as_declarative(*arg, **kw):
+    return _as_declarative(*arg, **kw)
+
+
+@util.moved_20(
+    "The ``has_inherited_table()`` function is now available as "
+    ":func:`sqlalchemy.orm.has_inherited_table`."
+)
+def has_inherited_table(*arg, **kw):
+    return _has_inherited_table(*arg, **kw)
+
+
+@util.moved_20(
+    "The ``synonym_for()`` function is now available as "
+    ":func:`sqlalchemy.orm.synonym_for`"
+)
+def synonym_for(*arg, **kw):
+    return _synonym_for(*arg, **kw)
+
+
+__all__ = [
+    "declarative_base",
+    "synonym_for",
+    "has_inherited_table",
+    "instrument_declarative",
+    "declared_attr",
+    "as_declarative",
+    "ConcreteBase",
+    "AbstractConcreteBase",
+    "DeclarativeMeta",
+    "DeferredReflection",
+]