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add update merge comncatentate two dictionaries.
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Here is a Python function to add update merge to combine two dictionaries

import collections

def dict_union(dict1, dict2):
    """Add update merge comncatentate two dictionaries."""
    dict3 = dict1.copy()
    dict3.update(dict2)
    return dict3

# Enter the dictionary
myDict1 = collections.OrderedDict()
myDict1['a'] = 1
myDict1['b'] = 2
myDict1['c'] = 3

# Enter the dictionary
myDict2 = collections.OrderedDict()
myDict2['a'] = 1
myDict2['b'] = 2
myDict2['c'] = 3

# Calling the function
print((dict_union(myDict1, myDict2)))

#Example Output
# OrderedDict([('a', 1), ('b', 2), ('c', 3)])

#Remember to inspect code for bugs.