Modes: V - vertex mode - click to create a new unconnected vertex E - edge mode - click two consecutive vertices to connect or disconnect them M - move mode - allows you to reposition vertices C - connected vertex mode - click to create a new vertex that is connected to all previous nodes D - delete mode - click a node to delete it (to be implemented) N - numbers - shows the number of each vertex (the first one placed is number one and so on)
