An apparatus and method for winding a sheet of aligned parallel yarns onto a beam is described. To provide a system for detecting a closed pattern, which is a maximum set of items, based on history information which records a set of items that is a target of transaction processing for each transaction. Also disclosed are 10 MW to 1000 MW Closed Cycle MHD power plants fired by natural gas into a top half of a falling pebble bed heat exchanger that transfers 2000\xb0 K to 3000\xb0 K heat to a noble or diatomic gas in a bottom half of the exchanger that on exit is seeded with an alkali metal rendering the gas conducting.