func extract(c chan task) []task {
Blockchain already being adopted by some big-name companies, such as Walmart, AIG, Siemens, Pfizer, and Unilever. For example, IBM's Food Trust uses blockchain to track food's journey before reaching its final destination.
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Streams are iterables.
if urlparse(full_url).netloc == urlparse(self.base_url).netloc:
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