diff --git a/venv/Lib/site-packages/pip/_internal/resolution/__init__.py b/venv/Lib/site-packages/pip/_internal/resolution/__init__.py
new file mode 100644
index 0000000..06d7405
Binary files /dev/null and b/venv/Lib/site-packages/pip/_internal/resolution/__init__.py differ
diff --git a/venv/Lib/site-packages/pip/_internal/resolution/base.py b/venv/Lib/site-packages/pip/_internal/resolution/base.py
new file mode 100644
index 0000000..5ec4d96
--- /dev/null
+++ b/venv/Lib/site-packages/pip/_internal/resolution/base.py
@@ -0,0 +1,20 @@
+from typing import Callable, Optional
+
+from pip._internal.req.req_install import InstallRequirement
+from pip._internal.req.req_set import RequirementSet
+
+InstallRequirementProvider = Callable[
+    [str, Optional[InstallRequirement]], InstallRequirement
+]
+
+
+class BaseResolver:
+    def resolve(
+        self, root_reqs: list[InstallRequirement], check_supported_wheels: bool
+    ) -> RequirementSet:
+        raise NotImplementedError()
+
+    def get_installation_order(
+        self, req_set: RequirementSet
+    ) -> list[InstallRequirement]:
+        raise NotImplementedError()