dropWhile +containers

dropWhileL :: (a -> Bool) -> Seq a -> Seq a
containers Data.Sequence
O(i) p xs</tt> returns the suffix remaining after takeWhileL p xs.
dropWhileR :: (a -> Bool) -> Seq a -> Seq a
containers Data.Sequence
O(i) p xs</tt> returns the prefix remaining after takeWhileR p xs. dropWhileR p xs is equivalent to reverse (dropWhileL p (reverse xs)).