Counter()
Counter({'a': 3, 'd': 1, 'g': 1, 'h': 1, 'l': 2})
Counter({'red': 4, 'blue': 2})
0
Counter({'red': 4, 'blue': 2})
Counter({'red': 4, 'blue': 2, 'green': 0})


Counter({'d': 1, 'e': 1, 'h': 1, 'l': 3, 'o': 2, 'r': 1, 'w': 1, ' ': 1, '!': 1})
Counter({'d': 1, 'e': 4, 'h': 2, 'i': 1, 'l': 5, 'n': 1, 'o': 3, 'r': 2, 's': 1, 'u': 1, 'v': 1, 'w': 1, ' ': 2, '!': 2})
[' ', ' ', '!', '!', 'd', 'e', 'e', 'e', 'e', 'h', 'h', 'i', 'l', 'l', 'l', 'l', 'l', 'n', 'o', 'o', 'o', 'r', 'r', 's', 'u', 'v', 'w']
[('l', 5), ('e', 4)]
[('l', 5), ('e', 4), ('o', 3), ('r', 2), ('!', 2), ('h', 2), (' ', 2), ('n', 1), ('s', 1), ('u', 1), ('v', 1), ('w', 1), ('i', 1), ('d', 1)]
Counter({1: 6, 2: 4, 3: 3})
Counter({1: 1, 2: 6, 3: 3, 4: -7})
Counter({1: -1, 2: 6, 3: 3, 4: -7})
Counter({1: 7, 2: 6, 3: 1, 4: -7})
Counter({1: 12, 2: 4, 3: 1, 4: 0})
Counter({1: 14, 2: 4, 3: 1, 4: 0})
Counter({1: 6, 2: 4, 3: 3, 4: 0})