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contains

kotlin-stdlib / kotlin.collections / AbstractMutableList / contains
Platform and version requirements: 
open fun contains(element: @UnsafeVariance E): Boolean
Platform and version requirements: JS (1.1), Native (1.3) 
open fun contains(element: E): Boolean

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Licensed under the Apache License, Version 2.0.
https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.collections/-abstract-mutable-list/contains.html