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 Syntax 1: Condition evaluated; if True, statementblock executed, and so on
           (WHILE); if False, statementblock executed until True (UNTIL).
 DO [{WHILE | UNTIL} condition]
      [statementblock]
      [EXIT DO]
      [statementblock]
 LOOP
 
 Syntax 2: Statementblock executed, then condition evaluated; if True,
           statementblock re-executed, and so on (guaranteed one-time
           execution of statements).
 DO
      [statementblock]
      [EXIT DO]
      [statementblock]
 LOOP [{WHILE | UNTIL} condition]
 
 Usage Notes
   ■ EXIT DO can be used only in a DO...LOOP statement.
 
   ■ When EXIT DO is used within nested DO...LOOP statements, control is
     transferred out of the immediately enclosing loop.
 
   ■ You can use a DO...LOOP statement instead of a WHILE...WEND
     statement. DO...LOOP is more versatile than WHILE...WEND because it can
     test for condition at the beginning or at the end of a loop.