The following steps will serve as a guideline to find all pairs from five selected countries:

1. Load the notebook with commands developed in step 2.1. (click on the link):

https://colab.research.google.com/drive/1-2AUAiSZ1TqRFAomTGDU3WP0MIaookXy?usp=sharing

2. Create a list with the name of the five selected countries: 

list_names = ['Afghanistan', 'Albania', 'Algeria', 'American Samoa', 'Andorra']

3. Use the command combinations from the itertools package to compute all possible pairs:

import itertools

combinations = itertools.combinations(list_names, 2)

list_pairwise_comb = list(combinations)

[('Afghanistan', 'Albania'), 

('Afghanistan', 'Algeria'), 

('Afghanistan', 'American Samoa'), 

('Afghanistan', 'Andorra'), 

('Albania', 'Algeria'), 

('Albania', 'American Samoa'), 

('Albania', 'Andorra'), 

('Algeria', 'American Samoa'), 

('Algeria', 'Andorra'), 

('American Samoa', 'Andorra')] 

4. Select the first generated pair with the command list_pairwise_comb[0] and store it at variable first_pair:

first_pair = list_pairwise_comb[0]

('Afghanistan', 'Albania') 

5. Select the first element of the first pair first_pair[0]:

first_pair[0]

'Afghanistan'

6. The Python code with all the steps is summarized in this Google Colab (click on the link):

https://colab.research.google.com/drive/1B2xiY2xg-VL_tWxJfqNKXAbTuBio2ksJ?usp=sharing