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A variable buffer is a spatial model that shows the limits around waterbodies and any other surface hydrological features within which no subsurface sewage treatment system may be built.The variables that change the shape of the buffer are soil types , soil hydraulic conductivity , slope or gradient of the terrain and fixed distances around streams and waterbodies . Though preliminary , the research indicates that cocoa and chocolates not only contain natural compounds that can protect the heart and blood vessels but also that the quantities present in commercial products may be sufficient to exert measurable effects . The RealArcade mobile content site will offer mobile versions of many hit casual games , including Super Collapse , Luxor , Zuma , and Jewel Quest . We believe this direct mail plan would be more effective and help us better allocate precious resources to other need recruitment initiatives , if our yield efforts were supplemented by an e-mail communication plan . Unlike AC , large nodules of AF tend to become painful ulcers with overhanging borders surrounding exudative necrotic plaques that become confluent .