Hi again, Based on the discussion I can suggest the following concrete changes: - for now, use both Perm and Permutation as names for the class defining a permutation - similarly, use both PermGroup and PermutationGroup as names for the class defining a permutation group - remove the checks from Perm, and make a *function* PermS (the name is deliberately chosen to be as close as Perm) that performs the checks and then constructs a permutation object using Perm (the name comes from Permutation Safe).
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