forgot full listing:
scala> List[Int](6, 7, 8, 1, 2, 3, 4, 1, 11, 10 ,11 ,12 ,13,
| 3).foldLeft(List[List[Int]]()){(a,b)=>
| if(a.isEmpty) List(List(b))
| else if(a.last.last < b) a.dropRight(1):::List(a.last:+b)
| else a:::List(List(b))
|
}.filter(_.length>1).foldLeft(List[Int]()){(a,b)=>if(a.length>=b.length)
| a else b}
res0: List[Int] = List(1, 2, 3, 4)
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