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However, these sites are the exception rather than the rule and there is no reason to believe that the exclusion of these sites from the study will cause a systematic bias in the sample. The domain name generated in this way may not be a valid URL, that is, such a website may not exist. Therefore each domain name generated needed to be verified.

If the attempted connection to a randomly generated URL was unsuccessful after three tries, then the URL was discarded and another URL was generated and the connection tested again. The process continued until a sufficiently large number of valid sites was found for a further filtering process (described below).