Depression is a serious health problem, especially in adolescence.

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Pereira[A] 1. IntroductionThe extraordinary growth of computer applications, particularly over the last two decades, has enabled the easy compilation and exploration of large corpora and lexica.These linguistic resources play a fundamental role in the areas of theoretical linguistics and natural language engineering. Combining these two areas of knowledge can, in fact, result in the development of a large number of applications, such as new and straightforward descriptions of languages based on real data; contrastive studies between varieties of a particular language aiming at finding factors of unity and diversity; cross-linguistic contrastive studies; grammars; lexica and dictionaries; terminologies; assisted translation materials; language teaching materials; computer tools and applications for processing natural language.Having this principle in mind and following the tradition at the Centre of Linguistics of the University of Lisbon (CLUL) i of collecting and studying real language data, a large electronic corpus -the Corpus de Referência do Português Contemporâneo (Reference Corpus of Contemporary Portuguese, CRPC) -is being compiled at CLUL since 1988.The CRPC currently contains approximately 310 million words, searchable through a user-friendly interface, and it is envisaged as a monitor corpus (from which one can extract balanced subcorpora) that can serve as a sample of the Portuguese language (both in its written and spoken varieties).

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