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dictionary = {'Barcelona': 'Messi', 'Real Madrid': 'Modric'}

dictionary['Barcelona'] = 'Messi'
print(dictionary)
dictionary['PSG'] = 'Neymar'
print(dictionary)
del dictionary['Real Madrid']
print(dictionary)
print('Bayern Münih' in dictionary)
print('Barcelona' in dictionary)
dictionary.clear()
print(dictionary)