arangosh> var examples = require("org/arangodb/graph-examples/example-graph.js");
arangosh> var graph = examples.loadGraph("routeplanner");
arangosh> graph._countCommonProperties({}, {}, {vertex1CollectionRestriction : 'germanCity',
........> vertex2CollectionRestriction : 'germanCity' ,ignoreProperties: 'population'});
[ 
  { 
    "germanCity/Cologne" : 1 
  }, 
  { 
    "germanCity/Hamburg" : 1 
  } 
]