This code is a rewrite rule that tells WordPress to take any URL that matches the pattern and redirect it to the specified URL. The pattern is made up of three capture groups, each of which will be captured and stored in the $matches array. The first capture group will be stored in $matches[1], the second in $matches[2], and the third in $matches[3]. The destination URL uses the $matches array to insert the captured values into the pagename, subpagename, and subsubpagename query parameters.
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