anchor.diff:  
   === 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.
  +This is a some kind of combination of `skip` and `take`, and returns an observable
  +sequence that represents a portion delimited by start and end of the source
  +observable sequence.
   
   [source, clojure]
   ----
  
positive.code: === Consume error termination
  
  With `on-error` function you can watch the error termination of an observable
  seequence:
  
  [source, clojure]
  ----
  
negative.code: 
  === Concat
  
  This cobinator concatenates two or more observable sequences.
  
  [source, clojure]
  ----
  