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If we set a higher limit on the number of letters, the possible permutations of the domain names would increase exponentially and the vast majority of these randomly guessed domain names would not exist.
Thus the time for data collection would increase greatly. For similar reasons, previous studies have also traditionally set a limit on the length of domain names-for example, the Vaughan and Thelwall (2004) study set a limit of four letters. It is acknowledged that this sampling method excluded websites that have more than six letters in their domain names, introducing a bias favoring abbreviated domain names.