Examples

 Example:

     FOR I := 1 TO 10 DO
       FOR J := 1 TO 10 DO
          A[I,J] := 0;


 This example shows how you can nest FOR loops.  For  each  value
 of  I,  the executing program steps through all 10 values of the
 array J and assigns the value 0 to each component.

 Example:
  
    FOR I IN Set 1 DO
       Set2 := Set2 + [I + 1];


 This example shows a FOR-IN statement.   Set2  is  assigned  the
 successor of each value in Set1.