LIST
 GLOBAL_VARIABLE_DECLARATION
  LIST
   ARRAY_INDEXING
    IDENTIFIER (array)
    NUMBER_LITERAL (3)
   ARRAY_INDEXING
    IDENTIFIER (other)
    NUMBER_LITERAL (20)
 FUNCTION
  IDENTIFIER (sum)
  LIST
  BLOCK
   LIST
    RETURN_STATEMENT
     OPERATOR (+)
      OPERATOR (+)
       ARRAY_INDEXING
        IDENTIFIER (array)
        NUMBER_LITERAL (0)
       ARRAY_INDEXING
        IDENTIFIER (array)
        NUMBER_LITERAL (1)
      ARRAY_INDEXING
       IDENTIFIER (array)
       NUMBER_LITERAL (2)
 FUNCTION
  IDENTIFIER (main)
  LIST
  BLOCK
   LIST
    ASSIGNMENT_STATEMENT
     ARRAY_INDEXING
      IDENTIFIER (array)
      NUMBER_LITERAL (0)
     NUMBER_LITERAL (5)
    ASSIGNMENT_STATEMENT
     ARRAY_INDEXING
      IDENTIFIER (array)
      NUMBER_LITERAL (1)
     NUMBER_LITERAL (1)
    ASSIGNMENT_STATEMENT
     ARRAY_INDEXING
      IDENTIFIER (array)
      NUMBER_LITERAL (2)
     ARRAY_INDEXING
      IDENTIFIER (array)
      NUMBER_LITERAL (1)
    ASSIGNMENT_STATEMENT
     ARRAY_INDEXING
      IDENTIFIER (other)
      FUNCTION_CALL
       IDENTIFIER (sum)
       LIST
     FUNCTION_CALL
      IDENTIFIER (sum)
      LIST
    PRINTLN_STATEMENT
     LIST
      STRING_LITERAL ("Should be 7:")
      ARRAY_INDEXING
       IDENTIFIER (other)
       NUMBER_LITERAL (7)