Include a value in a set variable System unit
 procedure Include ( var SetVariable : set of SetValues; OneOfSet : SetValues ) ;
The Include procedure includes a set value in a set variable.
A set variable is one that can contain 0, some, or all values of a set. When you Include a set value in a set variable, you are adding to the included values in the variable.
Include is equivalent to the + operator, as shown here :
Include(CardHand, JackOfClubs);
CardHand := CardHand + [JackOfClubs];

For example, you can insert a playing card into a players hand - where the hand is based on a set of all playing cards in a deck.
Use Exclude to remove a value from a set variable. This would, for example, allow a card to be removed from a player's hand.
Related commands
Exclude Exclude a value in a set variable
In Used to test if a value is a member of a set
Set Defines a set of up to 255 distinct values
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Example code : Creating a variable containing only positive numbers 0 to 10
  evenNumbers : Set of 0..10;
  i : Integer;
  // Make sure that evenNumbers only contains even numbers
  evenNumbers := [];
  for i := 0 to 10 do
    if (i mod 2) = 0
    then Include(evenNumbers, i);

  // Now display the set contents
  for i := 0 to 10 do
    if i in evenNumbers
    then ShowMessage(IntToStr(i)+' is even');
Show full unit code
   0 is even
   2 is even
   4 is even
   6 is even
   8 is even
   10 is even
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