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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