The results presented in this paper have been developed as part of a collaborative project between SiDi and the Centre of Informatics at the Federal University of Pernambuco (CIn/UFPE), financed by Samsung Eletronica da Amazônia Ltda., under the auspices of the Brazilian Federal Law of Informatics no. 8248/91. The first and third authors were also partially supported by the Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq).
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