 		g0[1, 2] = 1
 		g0[2, 1] = -3
 		
-		XCTAssert(g0.kruskal() == nil)
 		
 		var g1 = G()
 		

		g1[3, 5] = 1
		
		// print(g1)
		_ = g1.hierholzer()!
		
		var g2 = G()
		

		g1[1, 2] = -3
		g1[2, 1] = -3
		
		let start = Date()
		
		XCTAssert(g0.kruskal() == nil)
		_ = g1.kruskal()!
		
		print("Kruskal:\t\t", -start.timeIntervalSinceNow)
