object Main {
 
	def f(ints: Seq[Int]): String = ints match {
	  	case Seq() =>
	      	"The Seq is empty !"
	  	case Seq(first) =>
	      	s"The seq has exactly one element : $first"
		case Seq(first, second) =>
		    s"The seq has exactly two elements : $first, $second"
		case _ =>
		    "The seq has more than two elements"
	}
 
	def main(args: Array[String]): Unit = {
		println(f(Seq()))
		println(f(Seq(1)))
		println(f(Seq(1, 2)))
		println(f(Seq(1, 2, 3)))
		println(f(Seq(1, 2, 3, 4)))
	}
 
}

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