fp2a.connect("in", "op1").connect("op1", "out");
FlowGraphGenerator fp2b = new FlowGraphGenerator();
fp2b.defineInput("in");
fp2b.defineOperator("op2", "in", "out");
fp2b.defineOutput("out");
fp2b.connect("in", "op2").connect("op2", "out");
FlowGraphGenerator fp1 = new FlowGraphGenerator();
fp1.defineInput("in");
fp1.defineFlowPart("fp2a", fp2a.toGraph());