anchor.diff:  
   === From range
   
  -An other way to create a observable stream is using the `range` constructor
  -that is pretty analgous to the clojure's one:
  +An other way to create an observable stream is using the `range` constructor
  +that is pretty analogous to the clojure's one:
   
   [source, clojure]
   ----
  
positive.code: 
  === Slice
  
  This is a some kind of combination of `skip` and `take`, and returns a observable
  seequence that represents a portion delimited by start and end of the source
  observable seequence.
  
  [source, clojure]
  ----
  
negative.code: 
  === Merge
  
  This combinator merges two or more observable sequences.
  
  [source, clojure]
  ----
  