sets

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• Sets in Python are used when we are primarily interested in operations that we know from the set theory.
• See also the Venn diagrams.
• In day to day speach we often use the word "group" instead of "set" even though they are not the same.
• What are the common elements of two set (two groups).
• Is one group (set) the subset of the other?
• What are all the elements that exist in both groups (sets)?
• What are the elements that exist in exactly one of the groups (sets)?