Manual:DIL Manual experience()

experience ( i : integer, u : unitptr )
   i : A integer number of experience to gain or loose.
   u : The player to receive the experience.
   result: The integer amount of experience is added to the players
           total amount of experience (thus causing more or less
           experience). USE WITH CARE! SUGGEST THAT YOU ONLY USE
           INTEGER CONSTANTS AS THE EXPRESSION TO AVOID ERRORS.

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