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Are you Sergio Rocha, author of the books below?
100 Coisas Que Todo Corredor Deveria Saber by Sergio Rocha Estratégias e Técnicas de Xadrez by Sergio Rocha Cadernos de xadrez  by Sergio Rocha Estat’stica Geral e Aplicada by Sergio Rocha Estatistica Geral e Aplicada by Sergio Rocha Reproducibility of Texas Department of Transportation falling... by Sergio Rocha Unity by Truth by Sergio Rocha Unity by Truth by Sergio Rocha Livro de Receitas do Planejamento by Valber Labre Xadrez - Técnicas e Estratégias by António Fróis


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