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Research design and methods

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Basic concepts<br />

Grammars<br />

Operations on strings<br />

◮ given a string x, a substring of x is any string formed from<br />

contiguous occurrences of symbols in x taken in the same<br />

order in which they occur in x<br />

◮ formally, y is a substring of x iff there exists strings z <strong>and</strong> w<br />

such that x = z ⌢ y ⌢ w<br />

◮ notice that both z <strong>and</strong> w may be empty<br />

Ivona Kučerová: <strong>Research</strong> <strong>design</strong> <strong>and</strong> <strong>methods</strong> COGSCIL 750

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