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fix correct preposition in kotlin flatten-array mentoring #2403

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fix correct preposition in kotlin flatten-array mentoring #2403

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4 changes: 2 additions & 2 deletions tracks/kotlin/exercises/flatten-array/mentoring.md
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Expand Up @@ -28,6 +28,6 @@ object Flattener {
```

## Common suggestions
* Remember that the solution must work for any type, not just `Int`s or lists on `Int`s (although the tests only test just these cases)
* Remember that the solution must work for any type, not just `Int`s or lists of `Int`s (although the tests only test just these cases).
* The `filterNotNull()` function can make your life easier. Include the nulls in your preliminary list, then filter them out.
* As a challenge, try __not__ using library function `flatMap()`, and instead find a different way
* As a challenge, try __not__ using library function `flatMap()`, and instead find a different way.
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