Python, how to undo a list within an other list

Question

As a result of a function I have a list with the elements inside another list, and I would like to extract this elements to have a unique list.

This is the list I have:

[['word'], ['word'], ['word'], ['word']]

This is the list I would like to have:

['word', 'word', 'word', word']

How can I do this?

Answer 1

list = [['word'], ['word'], ['word']]
output = []
for entry in list:
    for word in entry:
        output.append(word)
print(output)

Answer 2

import itertools

result = list(itertools.chain(*original_list))