*-----------------------*
 |ask "do you like ruby?"|            *--------------------------------*
 |                       +------------> ask "then, do you like python?"|
 *------------------+----*            |                                |
                    |                 *-----+------------------------+-*
                    |                       |                        |
                    |                       |                        |
                    |            *----------v----------------------* |
  *-----------------v-----------*|say "maybe you don't like LL..." | | 
  |say "maybe you like Haskell."|*---------------------------------* |
  *-----------------------------*                                    |
                                      *------------------------------v---*
                                      |                                  |
                                      |say "maybe you like OCaml."       |
                                      *----------------------------------*