How to understand "<since>" in git format-patch manual?

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I am reading the man page of git format-patch:

There are two ways to specify which commits to operate on.

  1. A single commit, <since>, specifies that the commits leading to the tip of the current branch that are not in the history that leads to the <since> to be output.

......

I am confused to understand "commits ... that are not in the history that leads to the <since> to be output.". I think it should be "...that are not in the history ...".

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