if I have a class like this ```data class Person val name St kotlinlang #stdlib

if I have a class like this ```data class Person(...

rrva

02/27/2018, 4:23 PM

if I have a class like this

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data class Person(val name: String, val citiesVisited: List<City>)

and

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City(val name: String, val population: Int)

how do I create a

Map<City, List<Person>>

with

groupBy

or similar?

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