Explain the constant current limiting circuit implemented in a series voltage regulator. How is this circuit modified to achieve a fold-back configuration?

A constant current limiting circuit in a series voltage regulator is designed to protect the regulator and the load from excessive current that could damage the components. The circuit typically uses a sense resistor to monitor the output current. If the current exceeds a preset threshold, the regulator ___ __________ ________ ___ ______ _________ _________ ____.
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