       iex> Enum.map(stream, &1 + 1)
       [3,5,7]
 
-  By simply passing a list (which is an enumerable) as first argument
+  By simply passing a list (which is an enumerable) as the first argument
   to `Stream.map/2`, we have automatically created a stream that will
   multiply the items in the list by 2 on enumeration.
 


  ## Creating Streams

  There are many functions in Elixir's standard library that returns
  streams, some examples are:

  * `IO.stream/1` - It streams input lines, one by one;
  * `URI.query_decoder/1` - Decodes a query string, pair by pair;

  This module also allows us to create streams from any enumerable:


  Notice we started with a range and then we created a stream that is
  meant to multiply each item in the range by 2. At this point, no
  computation was done yet. Just when `Enum.map/2` is called we
  enumerate over each item in the range, multiplying it by 2 and adding 1.
  We say the functions in `Stream` are *lazy* and the functions in `Enum`
  are *eager*.

  Due to their laziness, streams are useful when working with large 
  (or even infinite) collections. When chaining many operations with `Enum`,
  intermediate lists are created, while `Stream` creates a recipe of
  computations that are executed at a later moment. Let's see another
  example:

      1..3 |>
