anchor.diff:  
   === Concat
   
  -This cobinator concatenates two or more observable seequences.
  +This cobinator concatenates two or more observable sequences.
   
   [source, clojure]
   ----
  
positive.code: 
  === Scan
  
  Allows combine all results of an observable seequence using a combining function
  also called (reducing function). Returns a stream of each intermediate result
  instead of:
  
  
negative.code: 
  === From multiple values
  
  It there is a way for create an observable seequence from
  multiple values, using the `of` consturctor:
  
  [source, clojure]
  