system = {
let nodeA = new Node({name: "A", x: 0, z: 0, support: 'uw'});
let nodeB = new Node({name: "B", x: 2, z: 2, fz: 1});
let nodeC = new Node({name: "C", x: 4, z: 0, support: 'uw'});
let truss1 = new Truss({name: "1", nodes: [nodeA, nodeB], ea: 5});
let truss2 = new Truss({name: "2", nodes: [nodeB, nodeC], ea: 5});
let elements = [truss1, truss2];
let system = new System(elements);
system.solve();
return system;
}