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In [[formal language theory]], the '''empty string''', or '''empty word''', is the unique [[String (computer science)|string]] of length zero.
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Formally, a string is a finite, ordered sequence of [[character (symbol)|characters]] such as letters, digits or spaces. The empty string is the special case where the sequence has length zero, so there are no symbols in the string.
There is only one empty string, because two strings are only different if they have different lengths or a different sequence of symbols.
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