arangosh> var examples = require("org/arangodb/graph-examples/example-graph.js");
arangosh> var graph = examples.loadGraph("routeplanner");
arangosh> graph._countCommonNeighbors({isCapital : true}, {isCapital : true});
[ 
  { 
    "frenchCity/Paris" : [ 
      { 
        "germanCity/Berlin" : 3 
      } 
    ] 
  }, 
  { 
    "germanCity/Berlin" : [ 
      { 
        "frenchCity/Paris" : 3 
      } 
    ] 
  } 
]