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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 get_scalar_mirrored_target_option(self, option_name, target):
 """Get the attribute `field_name` from `target` if set, else from this subsystem's options."""

    mirrored_option_declaration = self._mirrored_option_declarations[option_name]
    return mirrored_option_declaration.get_mirrored_scalar_option_value(target)