public boolean contractEdge(V vertex1, V vertex2) {
		if (!adjList.containsKey(vertex1) || !adjList.containsKey(vertex2))
			return false;
		if (this.getEdge(vertex1, vertex2) != -1 ||
				this.getEdge(vertex2, vertex1) != -1) {
			if (vertex1.compareTo(vertex2) < 0) {
				for (V v : adjList.get(vertex2).keySet()) {
					if (v.compareTo(vertex1) != 0) {
						System.out.println("Added: outgoing: " + v);
						this.addEdge(vertex1, v, this.getEdge(vertex2, v));
					}
				}
				for (V v : adjList.keySet()) {
					if (adjList.get(v).keySet().contains(vertex2) &&
							v.compareTo(vertex1) != 0) {
						System.out.println("Added: incoming");
						this.addEdge(v, vertex1, this.getEdge(v, vertex2));
					}
				}
				this.removeVertex(vertex2);
				return true;
			} else {
				for (V v : adjList.get(vertex1).keySet()) {
					this.addEdge(vertex2, v, this.getEdge(v, vertex1));
					//this.addEdge(v, vertex2, this.getEdge(vertex2, v));
				}
				for (V v: adjList.keySet()) {
					if (adjList.get(v).keySet().contains(vertex1)) {
						this.addEdge(v, vertex2, this.getEdge(vertex2, v));
					}
				}
				this.removeVertex(vertex1);
				return true;
			}
		}
		return false;
	}