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Are you Yusnier Viera, author of the books below?
Domina las Tablas by Yusnier Viera Tu Cuadrado Magico by Yusnier Viera Basic Course of Mental Arithmetic by Yusnier Viera Curso Básico de Cálculo Mental by Yusnier Viera Domina las Tablas by Yusnier Viera Curso Básico de Calculo Mental by Yusnier Viera


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