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package com.mosol.sl;
case class Span[K <: Ordered[K]](low: Option[K], high: Option[K]) extends Function1[K, boolean] {
def apply(k: K): boolean = this match {
case Span(Some(low), Some(high)) => (k >= low && k <= high)
case Span(Some(low), None) => (k >= low)
case Span(None, Some(high)) => (k <= high)
case _ => false
}
}
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