code: def permissions_string(self) -> str:
      raise NotImplementedError()
  
file_path: PySyft/packages/syft/src/syft/serde/lib_permissions.py
imports: from enum import Enum
  from ..types.uid import UID
  from .serializable import serializable
label_desc: Use image node_id 1 for calling the CMPPermission obj's underlying member method code with example usage: obj.permissions_string() without return types