According to science journal New Scientist, the American company's security filter automatically deletes Web code that could be used by hackers and replaces it with innocuous words.

For example, 'eval' is converted to 'review', 'mocha' is changed into 'espresso' and 'expression' replaced with 'statement'.

A substitution is made even if the combination of letters appears within a word.

The combinations have been blacklisted because hackers are known to use them to embed potentially dangerous code into an e-mail message written in HTML, or hypertext mark-up language.

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