Generate all permutations: Two-character arrangements

What this Python exercise asks you to practise

This scenario tests generate all permutations. It belongs to the Recursion and Backtracking roadmap and uses the base case → make a smaller choice → recurse → undo if needed pattern.

Understand base cases, shrinking subproblems, recursive search, and choice-and-undo backtracking.

Skills and reported company tags

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