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This introduction explores the concept of string recognition, defining a string as a sequence of discrete items, such as letters or DNA sequences. For instance, the English word "hello" and a gene sequence "ATGGTTGGAATC" illustrate how strings manifest in different contexts. The text further explains that a particularly long string is referred to as text. Additionally, it defines a substring as a factor of a string, using the example that "CT" is a substring of "X". This foundational knowledge plays a critical role in fields like biology, linguistics, and computer science.
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