anchor.diff:  
   We can manipulate arrays with functions.
   
  -For example we can reverse and array with `rev` function.
  +For example we can reverse and array with the `rev` function:
   
   [source,text]
   ----
  
positive.code: features of a functional programming language. The syntax includes *variables*, *data structures*
  and a growing set of *mathematical functions*.
  
  Using the statistical programing syntax Solr's powerful `data retrieval`
  capabilities can be combined with in-depth `statistical analysis`.
  
  The `data retrieval` methods include:
  
   * SQL
   * time series aggregation
  
negative.code: 
  After the variables are set the `let` expression runs the `top` expression.
  
  The `top` expression is wrapping a `list` of `tuples`. Inside each tuple the `distance` function is used to compare
  the rateA vector with one of the other cities. The output of the distance function is stored in the distance field
  in the tuple.
  
  The `list` function emits each `tuple` and the `top` function returns only the tuple with the lowest distance.
  