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May 23rd, 2017
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  1. (*Liste predefinite dal linguaggio SML*)
  2. val empty = []; (*Liste vuota*)
  3. val numeri = 1::2::3::4::[];
  4.  
  5. hd numeri; (*head della lista*)
  6. tl numeri;  (*coda  della lista*)
  7.  
  8. fun search n lst = if lst = [] then
  9.                     false
  10.                     else
  11.                     if (hd lst) = n then true
  12.                     else search n (tl lst);
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