The invention introduces a method and system to automatically derive the relationships between query subjects and query items within query subjects so that problems such as those that result in double courting of information are avoided. A belt reeved over the fuser and tension rollers holds at least two idler rollers in place and forms a nip with the fuser roller. Connection of respective side panels and respective end panels form four corner sections each having a corner edge. A spectral interference between the light reflected into the waveguide from a first reflecting surface and a second reflecting surface varies as analyte molecules in a sample bind to the analyte binding molecules coated on the thin-film layer. The plate heat exchanger is arranged and configured such that the heat transfer plates can be removed from the plate heat exchanger without relocating any of the tie bars.