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We present a new sublinear-size index structure for finding all occurrences of a given q -gram in a text. Such a q -gram index is needed in many approximate pattern matching algorithms. All earlier q -gram indexes require at least O(n) space, where n is the length of the text. The new Lempel—Ziv index needs only O(n/log n) space while being as fast as previous methods. The new method takes advantage of repetitions in the text found by Lempel—Ziv parsing. [ABSTRACT FROM AUTHOR]