[]
[]
[]
[]
[(1, 'cheese')]
[(1, 'apple')]
[(1, 'apple')]
[(1, 'cheese')]
[('aardvark', 'Ethel'), ('cheese', 'cheddar'), ('eggs', 2), ('spam', 1)]
[('aardvark', 'Ethel'), ('cheese', 3), ('eggs', 2), ('spam', 1)]
[('cheese', 3), ('eggs', 2), ('spam', 1)]
[('aardvark', 'Ethel'), ('cheese', 'cheddar'), ('eggs', 2), ('spam', 1)]