Computer-implemented methods, systems and apparatus implement techniques for generating custom coclasses. The system also includes a detector circuit or program for automatically detecting an available arbitrage opportunity including a plurality of trades based on the credit parameter data, the arbitrage parameter data, and the trading data. an amount of surfactant represented by general formula relative to a total amount of the ink is in the range of about 0. The chamfered surfaces are at an angle to the top surface that lower and reduce drag that may occur between the impression element and a sheet of material as the impression element enters and exits the sheet.