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  Substring Command    Description
  X stringexpression   Execute substring. This command allows
                       you to execute a second substring from a
                       string. You may have one string expression
                       execute another, which executes a third, and
                       so on.
 
                       Numeric arguments can be constants like 123 or
                       variable names.
 
                       QuickBASIC requires the
 
                         "X" + VARPTR$(string-expression)
 
                       form of this command. This is different than
                       the BASICA form of the command.