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La ce serveste apostroful invers (`) ?

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Transforma o fucntie cu doua argumente intr-un operator infixat.

 Exemplu: 
  g :: Int -> Int -> Int
  g a b = a+b 
 Functia se poate folosi acum si ca un operator: 1 `g` 2 
 ... ceea ce e echivalent cu: g 1 2