I'm having a hard time on one of the myLot tasks..

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It's about the site searching task. I can't seem to understand the "back links" requirement where I should not include websites that has more than 50 back links? I used the link to validrank.com that shows the number of back links of a website. I don't understand the numbers that were shown, there's number results with the "www" and without the "www" domain.