anchor.diff:  
   === Classroom requirements
   
  -*  Screen or projector
  +*  Big screen or projector
   
   *  Windows or Linux Computer with `hangman.exe` or `hangman` binary installed.
   
  
positive.code: +
  image::02-Screenshot-Windows.png[]
  
  == Configuration
  
  === Synopsis and syntax
  
  include::../../src/main.rs[lines="51..91"]
  
  
  
  === Sample configuration file
  
  ==== Simple configuration file
  
  ----
  guess me
  
negative.code: 
  The aim of the game is to consolidate recently learned vocabulary. 
  For this purpose the class composes a vocabulary list of words or expressions,
  hereafter referred to as list of secrets words.
  
  *  The class composes the list of secrets together with the teacher. 
     To optimize the learning progress, it is most useful to involve the pupils 
     in the preparation of the list of secrets, e.g.:
     One pupil types the suggested words into the configuration file, the others
     follow at the screen and correct spelling mistakes. 
  
  *  The list of secrets can be recent vocabulary or calculation exercises. A
     secret is always encoded as one line in the configuration file and can be a
     word or a whole sentence of vocabulary or even a math exercise.
  
  *  To give an additional hint it, is possible to tag a part of the secret
     sentence. This part will be disclosed immediately when the game starts.   
  
  *  When the game starts the computer will choose one secret of the list
  *  randomly.  The teacher can also as he does not know either.
  
  
  === Game rules
  