{EdgeRenderingFunction -> {"(Arrow[#1,0.1]&)", "None"}, 
 MultiedgeStyle -> {"None", "All", "0.25"}, 
 PackingMethod -> {"\"LayeredTop\"", "\"NestedGrid\"", 
   "\"ClosestPackingCenter\""}, SelfLoopStyle -> {"None", "All", ".2", ".5"}, 
 VertexLabeling -> {"True", "False", "All", "Tooltip"}, 
 VertexRenderingFunction -> {"None"}}
