router2_default = APIRouter()
router4_override = APIRouter(
    prefix="/level4",
    tags=["level4a", "level4b"],
    dependencies=[Depends(dep4)],
    responses={
        404: {"description": "Client error level 4"},
        504: {"description": "Server error level 4"},
    },
    default_response_class=ResponseLevel4,
    callbacks=callback_router4.routes,
    deprecated=True,
)
router4_default = APIRouter()


@app.get(