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Eliminate from list of sets those that are equal (except for the order)
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How do I remove duplicates from a C# array?
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How can I efficiently generate a Set from a List structure?
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How to remove items from a list while iterating?
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How do I remove duplicate items from an array in Perl?
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Grouping the first two elements in a list of ordered triples
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Remove lines based on duplicates within one column without sort
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Removing duplicate strings from an array?
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Combining the second elements of a set of ordered pairs based on their first element