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setOf

fun <T> setOf(vararg elements: T): Set<T>

Returns a new read-only set with the given elements. Elements of the set are iterated in the order they were specified. The returned set is serializable (JVM).

inline fun <T> setOf(): Set<T>

Returns an empty read-only set. The returned set is serializable (JVM).

fun <T> setOf(element: T): Set<T>

Returns an immutable set containing only the specified object element. The returned set is serializable.

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https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.collections/set-of.html