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## Nested
### Instructions
Create a `nested` constant variable that contains
- arr: an array of the 3 values: 4, undefined, '2'
- obj: an object with 3 property (str, num & bool)
`nested` and `obj` must be frozen to prevent changes from them.
### Notions
- https://nan-academy.github.io/js-training/examples/data-structures.js
- https://devdocs.io/javascript/global_objects/object/freeze