fun <T, K> Grouping<T, K>.eachCount(): Map<K, Int>
Platform and version requirements: Kotlin 1.1
Groups elements from the Grouping source by key and counts elements in each group.
Return a Map associating the key of each group with the count of elements in the group.
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Licensed under the Apache License, Version 2.0.
https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.collections/each-count.html