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OPENDOOR= ((NEXT_STATION _A (XNOR) IR_IR LOCATION_A ·

NEXT_STATION _B (XNOR)IR_IR LOCATION_B)) + (NEXT_STATION_A (XNOR) SR LOCATION_A · NEXT_STATION_B(XNOR)SR LOCATION_B · 

            SERVICE_REQUESTED) · AT_STATION)