private items:Array<string> = ['Amsterdam', 'Antwerp', 'Athens', 'Barcelona',
    'Berlin', 'Birmingham', 'Bradford', 'Bremen', 'Brussels', 'Bucharest',
    'Budapest', 'Cologne', 'Copenhagen', 'Dortmund', 'Dresden', 'Dublin',
    'Düsseldorf', 'Essen', 'Frankfurt', 'Genoa', 'Glasgow', 'Gothenburg',
    'Hamburg', 'Hannover', 'Helsinki', 'Kraków', 'Leeds', 'Leipzig', 'Lisbon',