Funky enumerator usage

funky.scala

package controllers

import play.api._
import play.api.mvc._
import play.api.libs.ws._
import play.api.libs.iteratee._
import play.api.libs.concurrent._

object Application extends Controller {
	
	val EXPECTED_LENGTH = 15;
	
	def index = Action {
		val p1 = WS.url("http://linkedin.com").get().map{ _ => "linkedin" }
		val p2 = WS.url("http://zenexity.com").get().map{ _ => "zenexity" }
		val p3 = WS.url("http://news.ycombinator.com").get().map{ _ => "ycombinator" }

		val r = (Enumerator.flatten(p1.map( r => Enumerator(r:_*)))  >-
		Enumerator.flatten(p2.map( r => Enumerator(r:_*)))  >-
		Enumerator.flatten(p3.map( r => Enumerator(r:_*)))  &>
		Enumeratee.take(EXPECTED_LENGTH)) >>>
		Enumerator.enumInput(Input.EOF) |>>
		Iteratee.fold(List[Char]()){ (es, e: Char) => println(e); e :: es }

		val p = r.flatMap( _.pureFold(
					(res, _) => Ok(res.reverse.mkString),
					_ => NotImplemented,
					(err, _) =>  InternalServerError(err.toString)))

		AsyncResult(p)
	}
}

wihtoutOperator.scala

val r = (Enumerator.flatten(p1.map( r => Enumerator(r:_*)))  interleave
					Enumerator.flatten(p2.map( r => Enumerator(r:_*)))  interleave
					Enumerator.flatten(p3.map( r => Enumerator(r:_*)))  through
					Enumeratee.take(EXPECTED_LENGTH)) andThen
					Enumerator.enumInput(Input.EOF) apply
					Iteratee.fold(List[Char]()){ (es, e: Char) => println(e); e :: es }

withParenthesis.scala

val r = Enumerator.flatten(p1.map( r => Enumerator(r:_*)))
			.interleave(Enumerator.flatten(p2.map( r => Enumerator(r:_*))))
			.interleave(Enumerator.flatten(p3.map( r => Enumerator(r:_*))))
			.through(Enumeratee.take(EXPECTED_LENGTH))
			.andThen(Enumerator.enumInput(Input.EOF))
			.apply(Iteratee.fold(List[Char]()){ (es, e: Char) => println(e); e :: es })