code: def schemes() -> Set[str]:
      return {
          scheme
          for fs_class in RouterAsyncFS.FS_CLASSES
          for scheme in fs_class.schemes()
      }
  
file_path: hail/hail/python/hailtop/aiotools/router_fs.py
imports: from typing import Any, Optional, List, Set, AsyncIterator, Dict, AsyncContextManager, Callable, ClassVar, Type
  import asyncio
  from contextlib import AsyncExitStack
  from ..aiocloud import aioaws, aioazure, aiogoogle
  from .fs import AsyncFS, MultiPartCreate, FileStatus, FileListEntry, ReadableStream, WritableStream, AsyncFSURL
  from .local_fs import LocalAsyncFS
  from hailtop.config import ConfigVariable, configuration_of
label_desc: Use image node_id 2 for calling the RouterAsyncFS obj's underlying member method code with example usage: obj.schemes() and returns: unknown