send_payment(&nodes[0], &vec!(&nodes[1])[..], 8000000, 8_000_000);
send_payment(&nodes[0], &vec!(&nodes[1])[..], 8000000, 8_000_000);
send_payment(&nodes[0], &vec!(&nodes[1])[..], 8000000, 8_000_000);
send_payment(&nodes[0], &vec!(&nodes[1])[..], 8000000, 8_000_000);