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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def Start(self):
 """Query the client for available Volume Shadow Copies using a WMI query."""

    self.state.shadows = []
    self.state.raw_device = None

    self.CallClient(
        server_stubs.WmiQuery,
        query="SELECT * FROM Win32_ShadowCopy",
        next_state="ListDeviceDirectories")