val my_urls = """urbanc""".r+
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+
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def crawl(url: String, n: Int) : Unit = {+
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  if (n == 0) ()+
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  else if (my_urls.findFirstIn(url) == None) ()+
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  else {+
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    println(s"Visiting: $n $url")+
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    for (u <- get_all_URLs(get_page(url))) +
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      crawl(u, n - 1)+
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  }+
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}+
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