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### Relevant Articles:
- [Using a Custom Class as a Key in a Java HashMap](https://www.baeldung.com/java-custom-class-map-key)
- [Nested HashMaps Examples in Java](https://www.baeldung.com/java-nested-hashmaps)
- [Java HashMap With Different Value Types](https://www.baeldung.com/java-hashmap-different-value-types)