http://www.google.es/search?hl=en&site=imghp&tbm=isch&source=hp&biw=1265&bih=754&q=sector+terciario&oq=sector+terc&gs_l=img.1.0.0l4j0i5l3j0i24l3.50234.58953.0.61031.9.8.0.1.1.0.875.3516.5-3j2.5.0...0.0...1ac.1.12.img.aqacZ4tavn8
http://www.google.es/search?hl=en&site=imghp&tbm=isch&source=hp&biw=1265&bih=754&q=sector+terciario&oq=sector+terc&gs_l=img.1.0.0l4j0i5l3j0i24l3.50234.58953.0.61031.9.8.0.1.1.0.875.3516.5-3j2.5.0...0.0...1ac.1.12.img.aqacZ4tavn8
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