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SET, RMS_DEFAULT, Qualifiers, /EXTEND_QUANTITY
 *Conan The Librarian 

       /EXTEND_QUANTITY=n

    Specifies the number of blocks n to extend a sequential file
    where n can range from 0 to 65535. If you do not specify the
    /EXTEND_QUANTITY qualifier, RMS calculates its own extend value.
    The /EXTEND_QUANTITY qualifier value is used when the program
    does not specify an extent quantity explicitly.
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