Figure 1: Overview of the elements of the MATCHIT automaton. The inlet is populated with four chemtainers, carrying the substances 1 to 4, respectively, and equipped with different chemtainer tags (color of circle). The tube consists of five cells which are equipped with individual cell tags. The color of the bar at the bottom of each cell implies which particular cell tag is used. The arrow shows how chemtainer at the front of the inlet would be inserted into the tube.