1) create database with three columns for 'depth level' 'link' 'read'
2) depth level = 0 Base url;
3) while $# array_urls
4) write to database ("depth level, $array_url")
5) $depth ++
6) trigger the db
7) read each link from database and extract further links found, to the databse.
8) until depth level = 3;
9) stop!
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