Recursion
I. Recursive field
II. Recursive merging
III. Recursive directory
IV. Recursive reference of single record
1. Recursively find references
2. Recursively find references until the specified value
V. Recursive reference of multiple records
1. Only search the upper level reference
2. Recursively find references until the specified value
3. Only search leaves
4. Find all upper level references
VI. Function recursion
1. The Hanoi Tower problem
2. The pirate money sharing problem
VII. Script recursion
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