Write the mechanism of Pinacol-pinacolone reaction. 

The pinacol-pinacolone reaction is an acid-catalyzed rearrangement of a vicinal diol (pinacol) to form a ketone (pinacolone). The mechanism proceeds through the following steps:

1. Protonation of the Hydroxyl Group:
   The reaction begins with the protonation of one hydroxyl group of the vicinal diol by the ___ _____ ________ ________ _____ ____ _______ _______ ________ ____ ______.
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