| http://www.w3.org/ns/prov#value | - re characters (e.g., insertion of a caret symbol or pound sign anywhere in the string or in a specific location such as at the end or beginning of the string, add a space at the beginning or end of the string, insert an exclamation mark after the first consonant, insert the number ???7??? after the fourth character, etc.); and(c) Replacing one or more characters of the CAPTCHA string, such as repl
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