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In order to work around the limitations of legacy encodings, HTML is designed such that it is possible to represent characters from the whole of Unicode inside an HTML document by using a numeric character reference: a sequence of characters that explicitly spell out the Unicode code point of the character being represented. A character reference takes the form &#N;, where N is either a decimal number for the Unicode code point, or a hexadecimal number, in which case it must be prefixed by x. The characters that compose the numeric character reference are universally representable in every encoding approved for use on the Internet.[citation needed]