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I am not sure of this, but kindly view this article in Wikipedia about a synchro. May be if you read this, you can understand something and, probabl, you can answer your own question.
Looking forward to see this question answered by you., here's the link.
<a href="https://en.wikipedia.org/wiki/Synchro" target="_blank" rel="nofollow noopener noreferrer">Synchro</a>
Thank you.