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object Test {
type Histogram[X] = Map[X, Int]
type StringlyHistogram[X >: String] = Histogram[X]
val xs: Histogram[String] = Map[String, Int]()
val ys: StringlyHistogram[String] = xs
def e = xs
val zs: StringlyHistogram[_] = e
type IntMap[Y] = Map[Int, Y]
val is = Map[Int, Boolean]()
val js: IntMap[Boolean] = is
val ks: IntMap[_] = is
type RMap[X, Y] = Map[Y, X]
val rs = Map[Int, Float]()
val ss: RMap[Float, Int] = rs
}
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