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a = a + "<TD><a href='perit.htm' onMouseOver='cambia_imagen(2)' onMouseOut='vuelve(2)'><img src='imagenes/en_perit_a.gif' BORDER=0 alt='Surveys'></a></TD>";
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a = a + "<TD>&nbsp;<a href='valorac.htm' onMouseOver='cambia_imagen(3)' onMouseOut='vuelve(3)'><img src='imagenes/en_valor_a.gif' BORDER=0 alt='Material and inmaterial goods valuation'></a></TD>";
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