Perhaps its SIN-BKK-SIN-NRT? If it was one of your trips, however, it would be more like SIN-BKK-SIN-FRA-LHR-FRA-JFK-LAX-SFO-YVR-SFO-LAX-JFK-FRA-LHR-FRA-SIN-BKK-SIN-SYD-SIN-NRT (I've probably missed half the flights but you get the general idea).