avocado> var Graph = require("graph").Graph;

avocado> g = new Graph("vertices", "edges");
Graph("vertices", "edges")

avocado> v1 = g.addVertex();
Vertex(<graph>, "153246:8712055")

avocado> v2 = g.addVertex();
Vertex(<graph>, "153246:8777591")

avocado> v1.addInEdge(v2);
Edge(<graph>, "3999653:8908663")

avocado> v1.getInEdges();
[ Edge(<graph>, "3999653:8908663") ]