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A Red Hat training course is available for Red Hat Enterprise Linux

12.15. 输​​​​​​​入​​​​​​​安​​​​​​​装​​​​​​​号​​​​​​​码​​​​​​​

Enter your Installation Number (refer to 图 12.11 “Installation Number”). This number will determine the package selection set that is available to the installer. If you choose to skip entering the installation number you will be presented with a basic selection of packages to install later on.
Installation Number

图 12.11. Installation Number