presented by orange boxes. By convention, the input ports of
            a node are always on the left side, and the output ports are on the right. You can only connect output
            ports to input ports. One output can be connected to multiple inputs, but each in put can only be
            connected to one output. To make a connection, simply click on the first port to connect, and then
            on the second. A new curved line representing the connection will appear.
            </p>

           