"835827"^^ . . . . . . . . . . . . . . . . . . . . "Empty string"@en . . . . . . . . . . . . . . . . . . . . "In formal language theory, the empty string, or empty word, is the unique string of length zero."@en . . . . . . "6619"^^ . . . . . . . . . . "1038894157"^^ . . "In formal language theory, the empty string, or empty word, is the unique string of length zero."@en . . . . . . . . . . . . . . . . . . . . . . . . . . .