Hello everybody,

 I would like to correct the formula page 3 in the "Lettre de Caml" #4 :

 we read :

     for each k in {0,..,m-1} t_{i+k} = s_{i}

 the right formula is :

     for each k in {0,..,m-1} t_{k} = s_{i+k}

  t is the motif: i+m<n.
  string_length s returns n 
 and string-length t returns m.

-- Younes El Amrani.