space bar
['switch, electric switch, electrical switch', 'streetcar, tram, tramcar, trolley, trolley car', 'cash machine, cash dispenser, automated teller machine, automatic teller machine, automated teller, automatic teller, ATM', 'oscilloscope, scope, cathode-ray oscilloscope, CRO', 'stopwatch, stop watch', 'pencil box, pencil case', 'book jacket, dust cover, dust jacket, dust wrapper']