You are organizing a local football tournament. At the initial state, each team plays against every other one once.
The list teams contains the names of the participating teams. Which games will be played? Print out all of them.
For example, if teams = ['Best-ever', 'Not-so-good', 'Amateurs'], your output should look like as follows:
('Best-ever', 'Not-so-good')
('Best-ever', 'Amateurs')
('Not-so-good', 'Amateurs')
