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In page UTF-16:

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UTF-16 is often claimed to be more space-efficient than UTF-8 for East Asian languages, since it uses two bytes for characters that take 3 bytes in UTF-8. Since real text contains many spaces, numbers, punctuation, markup (for e.g. web pages), and control characters, which take only one byte in UTF-8, this is only true for artificially constructed dense blocks of text.[citation needed] A more serious claim can be made for Devanagari and Bengali, which use multi-letter words and all the letters take 3 bytes in UTF-8 and only 2 in UTF-16.