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In today's class, we will write a web crawler using Perl. The code will go to a website, download the raw HTML, find URLs, retrieve them, and store them in files. Initially, we will choose around 10 websites to avoid downloading everything. You can download as many websites as you have disk space for. The code will create HTML files numbered 0.html, 1.html, etc., and a map file with numbers and original URLs. Let's start with a Perl program named web crawler dot pl.