node n1 30 50 50 50 1 BOB black yellow black RECT node n2 230 90 50 50 2 YO 22 black cyan black CIRCLE connectNodes n1_to_n2 n1 n2 black 0 connectNodes n2_to_n1 n2 n1 black 0 marker dot n1 35 black green moveMarker dot n2 moveMarker dot n1 remove dot changeParam n1 text Ha changeParam n2 bkgrd orange