I.Alignment Grouping

1.Return the first matching member for each group

2.Return all matching members for each group

3.Put mismatching members in a separate group

II.Sequence-number-based Alignment Grouping

1. Return the first matching member for each group

2. Return all matching members for each group

3. Put each member into groups by a corresponding sequence

4. Segmental function

III.Enumeration Grouping

1.Put each member into the first matching group

2. Put mismatching members in a separate group

3. Match each member to multiple groups

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